What Was the Average Testosterone Level for an 18-Year-Old Male in 1985?
While exact numbers vary slightly across studies, most research estimates that a healthy 18-year-old male in 1985 had a total testosterone level between 600–800 ng/dL, with some individuals even measuring above 900 ng/dL. These levels were considered typical for lean, active young men with no underlying health conditions.
Decline in Modern Testosterone Levels
Fast forward to today: the average testosterone levels in young men have declined significantly.
Recent studies suggest that a healthy 18-year-old male now has an average testosterone level closer to 450–600 ng/dL. That’s a 15–30% drop over just a few decades.
One landmark 2007 study published in the Journal of Clinical Endocrinology & Metabolism found that:
- Men in 2004 had testosterone levels 17% lower than men of the same age in 1987.
- The decline was consistent across all age groups, not just older men.
Why the Drop in Testosterone Levels?
Several lifestyle and environmental factors are believed to contribute to this generational decline in testosterone levels
- Increased exposure to endocrine-disrupting chemicals (EDCs), which can interfere with hormone production and balance. These include:
- Phthalates – found in plastics, food packaging, and personal care products
- Bisphenol A (BPA) – commonly used in canned food linings and plastic containers
- Parabens – used as preservatives in lotions, shampoos, and other cosmetics
- Pesticides and herbicides – residues found in non-organic produce and household products
- Flame retardants – often found in furniture, mattresses, and electronics
- Pharmaceutical residues – including trace amounts of female birth control hormones and antidepressants that may enter public water systems through waste and water runoff
- Prescription medications – such as ADHD medications and antidepressants, which may alter hormone pathways in some individuals when used long-term
- Heavy metals such as mercury – often found in industrial pollution, seafood (especially large fish like tuna or swordfish). Chronic exposure to high levels of mercury has been shown in some studies to disrupt endocrine function and potentially impair testosterone production.
- Environmental Contaminants – Cleaning Products, Laundry Detergents & Air Fresheners – Many of these household items contain phthalates, ammonia, or synthetic fragrances that act as endocrine disruptors and may interfere with testosterone production
- Higher rates of obesity and insulin resistance
- More sedentary lifestyles
- Chronic stress, poor sleep, and hormonal imbalances
How Low Testosterone Affects the Body and Mind
Lower testosterone levels in males don’t just affect physical performance—they impact many aspects of mental and emotional health as well.
Common effects include:
- Mood swings, irritability, and low motivation
- Increased risk of depression and anxiety
- Difficulty concentrating and brain fog
- Fatigue and decreased stamina
- Increased abdominal fat and difficulty losing weight
- Loss of muscle mass and reduced strength
When testosterone is low, it can disrupt the hormonal balance that supports both your physical energy and emotional well-being. Over time, this imbalance can affect quality of life, relationships, productivity, and self-confidence.
Are We Unknowingly Feminizing Our Young Boys?
While the term “chemically feminizing” can be controversial, many experts and physicians are concerned that chronic exposure to endocrine-disrupting chemicals may be contributing to hormonal shifts in young males.
These chemicals—which are commonly found in plastics, processed foods, cosmetics, personal care products, and even public water supplies—can mimic or block natural hormones like testosterone. Over time, this exposure may influence:
- Delayed puberty and disrupted sexual development
- Reduced testosterone production in adolescence
- Increased body fat and reduced muscle tone
- Emotional changes, such as anxiety, passivity, or mood swings
Although more long-term research is needed, early evidence points to the importance of limiting exposure to these chemicals and supporting hormonal health from a young age.
At Dr. Fortino’s testosterone replacement therapy clinics in Philadelphia and New Jersey, we believe in proactive screening, education, and personalized hormone optimization to protect and restore healthy testosterone levels.
What Can You Do?
If you’re experiencing symptoms of low testosterone—such as low energy, brain fog, poor recovery, or reduced sex drive—you’re not alone.
At Dr. Fortino’s low testosterone clinics in and New Jersey and Philadelphia, we offer:
- Comprehensive hormone testing
- Low testosterone treatment and Testosterone Replacement Therapy (TRT)
- Metabolic support and personalized care
Our approach begins with comprehensive lab work, including blood testing to assess total and free testosterone levels, as well as other key markers like estrogen, thyroid function, lipid panels, and metabolic indicators.
This thorough evaluation helps identify the root cause of your symptoms and ensures that any treatment plan—including TRT.
Dr. Fortino is a men’s health specialist with over 25 years of experience in private practice treating men with low testosterone using Testosterone Replacement Therapy (TRT).
Testosterone Replacement Therapy & Male Fertility
While Testosterone Replacement Therapy (TRT) can help men feel stronger, more energized, and mentally sharper, it’s important to understand its effects on fertility.
TRT may reduce sperm production in some men by signaling the body to decrease natural testosterone and sperm output. For men who are trying to conceive or may wish to father children in the near future, this is a critical consideration.
If fertility is a current goal, Dr. Fortino will work with you to explore alternative options such as HCG (human chorionic gonadotropin) or clomiphene citrate, which can support testosterone levels without compromising sperm production.
Personalized treatment is key—and decisions about TRT should always be based on thorough lab testing, medical history, and future goals.
Lifestyle, Nutrition & Environmental Detox Tips to Support Healthy Testosterone
Recommendations to Support Healthy Testosterone
In addition to medical treatment such as low testosterone therapy, certain lifestyle changes can help support and maintain optimal testosterone levels:
- Maintain a healthy weight – Excess body fat, especially around the abdomen, can reduce testosterone production.
- Exercise regularly – Focus on resistance training (like weightlifting) and high-intensity interval training (HIIT).
- Prioritize quality sleep – Aim for 7–9 hours per night to support natural hormone production.
- Eat a balanced, whole-foods diet – Rich in lean proteins, healthy fats, good carb or insulin resistant foods as well as nutrient-dense vegetables and fruits.
- Reduce exposure to plastics and processed foods – Avoid microwaving food in plastic containers, and opt for glass or stainless steel when possible. Avoid drinking from plastic water bottles, especially if left in the sun or heat.
- Avoid personal care products with parabens, phthalates, and synthetic fragrance– These are often found in laundry detergents, deodorants, lotions, shampoos, and body creams and may act as hormone disruptors.
- Manage stress – Chronic stress elevates cortisol, which can suppress testosterone. Practice deep breathing, mindfulness, or regular physical activity.
- Limit alcohol and avoid smoking – Both can negatively affect testosterone and overall hormone health. Smoking, in particular, has been shown to disrupt endocrine function, reduce sperm quality, and negatively impact hormone levels over time.
- Support with targeted supplementation – Nutrients such as zinc, magnesium, vitamin D, and omega-3 fatty acids are all known to play essential roles in testosterone production, immune function, and overall hormonal balance. These can be integrated into your wellness routine based on lab testing and professional recommendations.
Making these lifestyle changes alongside medical guidance from a qualified men’s health provider can significantly enhance your results and long-term wellness.
If you’re searching for a testosterone replacement clinic near me, our Philadelphia and New Jersey testosterone replacement therapy clinics offer expert care and a highly personalized approach tailored to your individual needs.
Take the first step. Schedule your consultation today.
Frequently Asked Testosterone Questions
How is the right TRT dosage determined?
Dr. Fortino determines your personalized TRT dosage based on the results from your comprehensive lab testing—including your total and free testosterone levels—along with your symptoms, age, body composition, medical history, and overall health goals.
Testosterone dosages may be adjusted over time to ensure optimal results while minimizing side effects.
How often do I take the low testosterone injection?
The frequency of testosterone injections depends on the specific type prescribed and your individual treatment plan. Common Testosterone injection schedules range from once a week to once every two weeks.
Dr. Fortino will determine the optimal dosing schedule based on your lab results, symptoms, and personal health goals.
Will insurance cover my testosterone injections?
Coverage varies depending on your insurance provider, policy, and medical diagnosis. Some plans may cover testosterone replacement therapy if lab tests confirm clinically low testosterone and treatment is deemed medically necessary.
How much do testosterone injections cost?
The cost of testosterone injections can vary depending on the type of testosterone prescribed, dosage, injection frequency, and whether or not your insurance provides coverage.
Without insurance, the average out-of-pocket cost typically ranges from $100 to $160 per month. At Dr. Fortino’s TRT clinics, we strive to make hormone therapy as affordable as possible and offer transparent pricing during your consultation.
How long does it take for testosterone to work?
Many men begin to notice improvements in energy, mood, and focus within 3 to 4 weeks of starting TRT. Increases in muscle mass, strength, and libido may take 6 to 12 weeks or more, depending on individual factors and dosage.
Dr. Fortino a men’s health specialist will monitor your progress and adjust your plan to ensure you experience consistent, lasting results
Will TRT shrink my testicles?
It can in some cases. Testosterone therapy may suppress your body’s own production, which can cause testicular shrinkage. However, this effect can often be minimized with the use of medications like HCG, especially for men who want to preserve fertility.
Will TRT make me aggressive or cause ‘roid rage’?
Not in medically appropriate doses. TRT aims to restore hormone levels to a healthy range—not to excess. Most men report improved mood, focus, and emotional balance.
Do I have to be on TRT forever?
Not necessarily. Some men benefit from long-term therapy, while others may use it for a defined period. Your testosterone treatment plan should be individualized and reviewed regularly with your provider.
Can I take supplements instead of TRT?
Supplements can support testosterone production, especially if deficiencies are present, but they typically cannot replace hormone therapy in men with clinically low testosterone.
If you have more questions, Dr. Fortino offers detailed confidential Low T consultations to explore all your concerns before beginning any treatment.
What are the early signs of low testosterone?
Common early symptoms include fatigue, low sex drive, poor concentration, increased body fat (especially around the belly), mood swings, and reduced motivation.
How is low testosterone diagnosed?
Low T is diagnosed through blood tests that measure total and free testosterone levels, ideally done in the morning. Dr. Fortino also reviews your symptoms, medical history, and overall hormone balance.
At what age do testosterone levels typically decline?
Testosterone levels begin to decline naturally after age 30 at a rate of about 1% per year, though lifestyle and environmental factors can accelerate this process.
Can stress or lack of sleep lower testosterone?
Yes. Chronic stress increases cortisol, which suppresses testosterone. Inadequate sleep also reduces your body’s ability to produce and regulate hormones properly.
Can low testosterone affect my mental health?
Absolutely. Low T is associated with symptoms like depression, irritability, brain fog, and low self-esteem. Many men report significant mood improvements after restoring testosterone levels.
Can I build muscle more easily on TRT?
Yes, when combined with resistance training and a healthy diet, low testosterone therapy can enhance muscle protein synthesis, making it easier to build lean muscle mass and improve body composition.
Will TRT improve my sex drive and performance?
For many men, Testosterone treatment improves libido, erectile function, and overall sexual confidence. Results vary based on age, health status, and underlying conditions.
What are the possible side effects of testosterone therapy?
Some men may experience acne, oily skin, increased red blood cell count, or mood fluctuations. Side effects are usually manageable and monitored through regular check-ins with your provider.
Can I drink alcohol while on TRT?
Moderate alcohol consumption may not interfere significantly, but excessive drinking can negatively impact hormone levels and liver function. It’s best to limit alcohol and discuss habits with your men’s health provider.
What if my testosterone levels are “normal,” but I still feel off?
“Normal” lab ranges are broad, and not every man feels his best at the same levels. Symptoms, lifestyle, and free testosterone levels matter too. Dr. Fortino evaluates the full picture—not just the lab numbers.