Maybe you still have plenty of get up. It’s the go that seems to have gone missing.
You’re more tired than you used to be. The workout you once bounced back from now takes a little more out of you. Maybe you’ve noticed changes in your strength or body composition. Your motivation isn’t quite what it was.
And then there’s sex.
Maybe you’re thinking about it less often. Your desire has changed. Erections aren’t as reliable as they once were, or something about your sexual life simply feels different. For some men, that’s the change that finally gets their attention.
Fair enough.
At some point, testosterone may enter the conversation.
And this is where things can get confusing because testosterone has developed quite a reputation. We hear so much about “low T” that it can start to sound as though testosterone is responsible for everything from sex drive and muscle to energy, motivation and whether you feel like getting off the sofa.
Testosterone does affect some of those things. It also has a much bigger and more complicated role in the body.
So before we blame testosterone for every lousy thing that happens after forty, let’s figure out what’s actually going on.
Low T Can Look Like a Lot of Other Things
This is probably the most important part of the conversation.
Fatigue can happen with low testosterone. It can also happen because you’re sleeping five hours a night. Changes in sexual desire can be related to testosterone, but stress, medications, depression, relationship issues, alcohol use, poor sleep and other health conditions can affect desire too.
And erectile dysfunction deserves its own conversation. Testosterone can influence sexual desire, but an erection also depends on blood flow, nerves, medications, cardiovascular health and psychological factors. You can have erectile dysfunction with a normal testosterone level.
So if you tell me, “Something is off,” I’m not going to argue with you. You know when you don’t feel like yourself.
I just don’t want us deciding why before we’ve taken a good look.
How are you sleeping? Has your desire changed? What about erections, including morning erections? Are you losing strength? Has your weight or body composition changed? What medications are you taking? How much alcohol are you drinking? How are you feeling emotionally? Has anything else changed in your health?
And then, of course, there is the obvious question: What does your testosterone level actually show?
One Test Doesn’t Always Settle It
Testosterone isn’t a number we should guess from how someone looks or feels.
When testosterone deficiency is suspected in men, diagnosis generally involves both symptoms or signs that fit with testosterone deficiency and consistently low testosterone levels. Testosterone levels can vary during the day and can be affected by illness and other factors, so testing is generally done in the morning and a low result is usually confirmed rather than allowing one number to settle the entire question (Bhasin et al., 2018; Endocrine Society, 2026).
Sometimes additional testing is needed to understand why testosterone is low.
That matters because “low T” isn’t always simply the result of getting older. Certain medical conditions, obesity, medications and problems involving the testes, pituitary gland or hypothalamus can affect testosterone production (Bhasin et al., 2018).
This is one of those times when getting the right answer is more useful than getting the fastest treatment.
Because if testosterone really is part of the problem, now we can have a much more interesting conversation.
Okay, But What About Sex?
We knew we were coming back here.
Testosterone plays an important role in sexual desire, and men with confirmed testosterone deficiency may experience improvement in sexual symptoms with appropriate treatment (Bhasin et al., 2018).
But I don’t want to give you the impression that testosterone is an automatic reset button for your sex life.
If desire is the issue and testosterone is low, treatment may help. If erections are the issue, we may need to look beyond testosterone too. Blood pressure, diabetes, vascular disease, medications, smoking and other factors can affect erectile function.
Sometimes a change in sexual function even gives us an opportunity to discover something about health that deserves attention for reasons well beyond the bedroom.
That’s why sexual health shouldn’t be embarrassing healthcare.
If something has changed, say it. It’s information, just like telling a clinician that your sleep has changed or you’re having pain.
There’s no need to make it awkward. Sex is part of health too.
If Testosterone Is Low, What Can Treatment Actually Do?
This is where testosterone replacement therapy, or TRT, enters the conversation.
For appropriately selected men with confirmed testosterone deficiency, treatment is intended to restore testosterone to an appropriate range and improve symptoms related to the deficiency. Depending on the individual, that may include improvement in sexual symptoms and changes in areas such as lean body mass, anemia or bone health (Bhasin et al., 2018).
But TRT isn’t one treatment that looks exactly the same for everyone.
Testosterone can be given in different ways, including injections and topical gels, with other formulations available as well. What makes sense can depend on preference, cost, convenience, response and individual health considerations.
Treatment also requires follow-up. A clinician may monitor testosterone levels, symptoms and blood counts and consider prostate health and other factors based on age and individual risk. Testosterone can increase red blood cell production, for example, which is one reason monitoring matters (Bhasin et al., 2018).
The goal isn’t simply to get a higher testosterone number.
If we’re treating something, we want to know whether you actually feel and function better, while making sure treatment continues to make sense for your health.
There’s One Conversation Men Should Have Before TRT
Do you want more children?
That question can get lost when the immediate conversation is about energy, strength or sex.
Testosterone taken from outside the body can suppress the hormonal signals involved in sperm production. For someone who wants to preserve fertility, that can change the treatment conversation considerably. Clinical guidance recommends against beginning testosterone therapy in men planning fertility in the near term (Bhasin et al., 2018).
And this is exactly why your goals belong in the room.
Two people can have the same lab result and need very different conversations because their health histories, symptoms, priorities and plans for the future aren’t the same.
A number gives us information.
It doesn’t tell us everything about the person attached to it.
Wait—Testosterone Isn’t Just a Men’s Hormone
We tend to talk about testosterone as though men own it and women occasionally borrow some.
They don’t.
Women naturally produce testosterone too, although in different amounts. Androgens are part of female physiology and have roles in sexual function and musculoskeletal health, among other processes (Davis et al., 2019).
This becomes particularly interesting around menopause because conversations about women’s hormones tend to focus almost entirely on estrogen and progesterone.
Testosterone deserves a place in the conversation too.
But we shouldn’t take everything we just discussed about male testosterone deficiency and simply shrink the dose for women. The evidence and treatment considerations are different.
For women, the strongest evidence for testosterone therapy is much narrower than the long list of benefits sometimes attributed to it. Expert guidance supports considering testosterone therapy for appropriately assessed postmenopausal women with hypoactive sexual desire disorder, or HSDD—a persistent reduction in sexual desire that causes personal distress—after other factors that might be contributing have been considered (Davis et al., 2019).
That’s different from saying testosterone has been proven to fix every complaint associated with menopause, restore youthful energy or solve every change in body composition.
And if a woman’s sexual desire has changed, testosterone may be only one part of what’s happening. Estrogen changes, vaginal dryness or pain, medications, sleep, stress, mood, relationships and other health conditions can all enter the conversation.
Sexual health rarely fits neatly into one hormone.
What Are You Actually Trying to Get Back?
This may be the question I care about most.
When someone says, “I want my testosterone checked,” I want to know what brought them there.
Maybe it’s energy. Maybe it’s strength or recovery. Maybe sex has changed. Maybe your body feels different despite doing many of the same things you’ve always done.
Or maybe it’s harder to describe than any of that.
You just don’t quite feel like yourself.
That matters.
Then we can start sorting through what might actually be responsible instead of assuming testosterone is either the answer to everything or something we shouldn’t bother considering.
Sometimes testosterone may be part of the answer. Sometimes the conversation leads somewhere else: sleep apnea, medication effects, stress, cardiovascular or metabolic health, depression, another hormonal issue or several things happening at the same time.
And sometimes feeling better will involve more than one approach.
That isn’t a disappointing answer. Bodies are complicated. Good care makes room for that.
Maybe Your Go Isn’t Gone After All
Getting older changes us. Energy can change. Bodies change. Hormones change. Sexuality can change too.
But I don’t want “I’m getting older” to become the answer we automatically accept whenever something important about how we feel or function starts changing.
If you’ve noticed something, pay attention to it. Talk about it. Get the right evaluation. And if testosterone turns out to be part of the story, understand your options well enough to decide what makes sense for you.
You don’t need to chase the testosterone level—or the body, energy or sex life—you had at 25.
But you also don’t have to assume that feeling lousy is simply the price of another birthday.
Maybe the better question isn’t how to get your younger self back.
It’s what has changed, what can we do about it, and what would feeling more like yourself look like now?
There may still be plenty of get up and go left. It might just be worth finding out what has been getting in the way.
References
Bhasin, S., Brito, J. P., Cunningham, G. R., Hayes, F. J., Hodis, H. N., Matsumoto, A. M., Snyder, P. J., Swerdloff, R. S., Wu, F. C., & Yialamas, M. A. (2018). Testosterone therapy in men with hypogonadism: An Endocrine Society clinical practice guideline. The Journal of Clinical Endocrinology & Metabolism, 103(5), 1715–1744.
Davis, S. R., Baber, R., Panay, N., Bitzer, J., Perez, S. C., Islam, R. M., Kaunitz, A. M., Kingsberg, S. A., Lambrinoudaki, I., Liu, J., Parish, S. J., Pinkerton, J., Rymer, J., Simon, J. A., Vignozzi, L., & Wierman, M. E. (2019). Global consensus position statement on the use of testosterone therapy for women. The Journal of Clinical Endocrinology & Metabolism, 104(10), 4660–4666.
Endocrine Society. (2026). Statement on testosterone replacement therapy.
Sources reviewed: August 17, 2026.