One of the most common conversations I have with my male patients over 40 starts the same way. They describe fatigue that coffee doesn't fix, a shrinking interest in things they used to enjoy, difficulty maintaining muscle despite regular exercise, and mood changes that don't feel like them. Someone has usually told them this is just aging. That's not the whole story, and it's not a useful answer.
What happens to testosterone in midlife
Testosterone levels in men start a slow decline around age 30, usually about 1 percent per year. By the 40s, 50s, and 60s, the cumulative drop can be significant. The rate varies a lot between individuals. Genetics matter, but so do sleep quality, stress, body composition, diet, alcohol, and exercise. Two men the same age can have testosterone levels that differ by a factor of two, and the one with the lower level may or may not be symptomatic depending on the rest of the picture.
I see the full spectrum. Some men stay robust into their 70s. Others are notably low at 45. The useful question isn't "what's the average curve." It's what's happening in your specific body and whether it explains the symptoms you're actually having.
Signs worth investigating
Symptoms of low testosterone can be subtle and easy to attribute to something else. When several appear together, they often point to hormonal changes worth checking:
- Persistent fatigue despite adequate sleep
- Decreased muscle mass and strength, even with regular exercise
- Increased body fat, especially around the midsection
- Reduced libido and changes in sexual function
- Mood changes: irritability, low motivation, or low-grade depression
- Difficulty concentrating or "brain fog"
- Decreased bone density
- Sleep disturbances
When patients describe these, I take them seriously. The goal isn't to chase a single number. It's to understand what's actually happening and what, if anything, warrants treatment.
How I approach the workup
One of the advantages of having time is getting the testing right. I don't order a single morning testosterone and call it a day. Hormones exist in an interconnected system and understanding that system takes a fuller panel.
What I typically check: total testosterone, free testosterone (the biologically active form), SHBG (sex hormone-binding globulin), estradiol, LH and FSH (to distinguish whether the issue is in the testes or the pituitary signaling), thyroid function, comprehensive metabolic panel, A1C and fasting insulin, lipid panel with particle-size analysis, and inflammatory markers. We also talk through sleep quality, stress, medications, and alcohol, all of which move these numbers.
The labs alone don't drive the decision. The labs plus the clinical picture plus your goals drive the decision.
Treatment and the honest version of that conversation
If the labs confirm genuinely low testosterone and there are symptoms affecting quality of life, we have a detailed conversation about options. Testosterone replacement therapy can be a real fix for the right patient: better energy, improved body composition, better mood, better sleep. Done properly, it works.
It's not automatic, though. Testosterone therapy requires ongoing monitoring of labs and symptoms. It affects fertility; for men who still want children, that's a specific conversation. There are cardiovascular considerations and prostate considerations that have to be worked through, especially for older patients. For some men, the right answer is lifestyle first: fix the sleep, address the alcohol, improve body composition, and retest before considering medication. Lifestyle changes can meaningfully raise testosterone, and sometimes they're enough.
The approach for a 45-year-old executive with chronic work stress and poor sleep is different from the approach for a 60-year-old retiree whose symptoms have been worsening for years. The right plan is the one matched to your specific situation, not a protocol applied blindly.
Beyond testosterone
Testosterone gets most of the attention in men's-health conversations, which is fair but incomplete. In the same annual visit I'm usually looking at cardiovascular risk (lipid panel with particle analysis, ApoB, blood pressure trends, coronary calcium scoring for appropriate patients), metabolic risk (A1C, fasting insulin, body composition), cancer screening calibrated to family history and risk (colonoscopy, skin exam, lung screening where indicated, prostate workup after a real conversation about the tradeoffs), and mental health. The things men are most likely to die of or be debilitated by are almost always preventable or manageable when caught early.
For men who've spent decades prioritizing everything other than their own health, this kind of systematic review is overdue. The earlier in the 40s you start it, the more you get out of it.
If you want to talk it through
If you've been experiencing symptoms that don't feel right, or if you just want a serious baseline workup before the patterns get harder to reverse, I'm happy to talk through it. Reach out and we'll figure out whether my practice is the right fit for what you're trying to accomplish.
