What percentage of men have low testosterone?

There isn’t a single fixed percentage. “Low testosterone” (biochemically low T) varies a lot with age and how it’s defined.

- Common lab threshold: total testosterone < about 300 ng/dL (10.4 nmol/L).
- Rough estimates by age (not all with low T have symptoms):
- Men under 40: very rare (roughly 0–2%).
- Men 40–60: about 2–4% meet that threshold.
- Men 60–70: roughly 6–12%.
- Men over 70: up to about 20% or more.

Keep in mind:
- Many men with low T on a lab test don’t have symptoms.
- True symptomatic hypogonadism is less common than the percentage with low labs.
- Prevalence is higher in people with obesity, diabetes, or certain medical conditions.
- Diagnosis usually requires repeated morning measurements and symptom review.

If you have a specific age group or region in mind, I can tailor the estimate.