Is testosterone of all ages really crashing in the USA? - what the research says

Is testosterone of all ages really crashing in the USA? - what the research says

you’ve probably heard the claim:
“Men today have lower testosterone than their dads and grandfathers.”

That sounds like internet fear-mongering… but one of the most cited long-term studies on men’s hormones says there’s truth to it.

Massachusetts Male Aging Study (MMAS) – a long-running study that tracked men’s testosterone levels over nearly two decades.PubMed+1

And what they found is bigger than just “you get older, you get lower T.”

The Big Takeaway: Each New Generation Starts Lower

Researchers followed men aged 45–79 in the Boston area and took blood samples in three waves:

They weren’t just watching guys age. They asked a different question:

“If we compare a 60-year-old man in 1988 vs. a 60-year-old man in 2002…
do they have the same testosterone levels?”

The answer: No.

Even when men were the same age, later generations had lower average testosterone.

Analyses of this and similar data sets suggest:

  • A roughly 1–1.5% drop in average testosterone per year of calendar time, even after adjusting for age, weight, smoking, and other lifestyle factors.ResearchGate+1

  • That means a man in his 60s measured in the early 2000s could have 10–20% lower testosterone than a man the same age in the late 1980s.

In simple terms:

Today’s men aren’t just losing testosterone as they age —
they’re starting the race further behind.

It’s Not Just an “Old Guy” Problem

What’s even more worrying: this pattern isn’t limited to older men.

Other research looking at U.S. national health data (NHANES) and large international cohorts has found significant declines in testosterone in younger men as well, and similar age-independent drops in countries like Denmark, Finland, and Israel.PMC+1

So this isn’t just:

“You’re getting older, deal with it.”

It’s:

“Men of all ages now are trending lower than men the same age a few decades ago.”

Can We Blame Just Obesity or Bad Habits?

You’d think the obvious answer is:

  • More obesity

  • Worse sleep

  • Less movement

  • More stress

Those do drag testosterone down. But here’s the key part:

In the Massachusetts Male Aging Study and follow-ups:

  • Researchers adjusted for body weight, smoking, medications, and other health factors, and

  • The downward trend in testosterone still remained.ResearchGate+1

That suggests there’s something else going on at a population level.

Scientists don’t fully agree on the cause, but suspects include:

  • Endocrine-disrupting chemicals (like BPA, phthalates, some pesticides and plastics) that can interfere with hormone production and signalingcarieboyd.com+1

  • Ultra-processed diets and chronic sleep debt

  • Constant stress and low movement

  • Environmental or lifestyle shifts we haven’t fully mapped yet

We’re basically living in an environment that’s not friendly to male hormones — and it’s showing up in the data.

Why This Matters (Beyond Just “Feeling Manly”)

Testosterone isn’t just about muscle or libido. Research links healthy levels to:ResearchGate+1

  • Energy and motivation

  • Body composition (more muscle, less fat)

  • Metabolic health (insulin, blood sugar, belly fat)

  • Bone density

  • Mood, confidence, and sense of drive

  • Sexual function and fertility

So if each generation of men walks into adulthood with lower baseline testosterone, you’re not just talking about “less pump in the gym” — you’re talking about a real public-health issue.

What This Means for the BareForge Mission

For us at BareForge, this kind of data isn’t just a scary headline — it’s fuel.

It confirms what a lot of men already feel:

  • Lower drive

  • Lower resilience

  • Easier weight gain

  • Harder time feeling sharp, focused, and “on”

And it also confirms this is not just an individual failure problem.
There’s a systemic, generational trend pushing men in the wrong direction.

We can’t control every environmental factor, but we can control:

  • What we put in our bodies

  • How we move, sleep, and recover

  • How much we expose ourselves to known hormone disruptors

  • The standard we hold for the products we use

BareForge exists to support men with clean, intentional tools — and to remind you that you’re not crazy for feeling like the deck is stacked. It kind of is.

But that just means it’s even more important to:

Lift heavier standards.
Guard your health harder.
And forge yourself deliberately — not by accident.

Sources

  • Travison TG, et al. “A Population-Level Decline in Serum Testosterone Levels in American Men.” Journal of Clinical Endocrinology & Metabolism, 2007.PubMed+1

  • Az Integrated Medical. “A Population-Level Decline in Serum Testosterone Levels in American Men” (summary).azintegratedmedical.com

  • Carie Boyd’s Pharmacy. “Why Are Testosterone Levels Decreasing in Men?” (summary of MMAS and generational decline).carieboyd.com

  • Chodick G, et al. “Secular trends in testosterone: findings from a large state-mandated care provider.” BMC Medicine, 2020.PMC

  • Medichecks. “Why Are Men’s Testosterone Levels Decreasing?” (overview of generational decline and international data).Medichecks