Testosterone Levels by Age in Men: General Reference Guide

Testosterone levels vary between men and tend to change gradually with age. This guide explains general reference ranges and why your result always needs a doctor's interpretation.

General reference range for adult men

In Australia, total testosterone is usually reported in nanomoles per litre (nmol/L). Many labs use an adult male reference range of roughly 8–30 nmol/L. Labs differ in their methods and ranges, so always check the range printed on your own report.

How levels tend to change with age

Late teens to 30s: levels are typically at their highest during early adulthood.
40s and 50s: levels often decline gradually, though many men stay well within the reference range.
60s and beyond: average levels tend to be lower, and health conditions become a bigger factor.

These are general patterns, not targets. Two men of the same age can have very different levels and both be healthy.

Why one number isn't the whole story

Levels change through the day, so morning testing is preferred.
Illness, poor sleep and some medicines can temporarily lower results.
Free testosterone and SHBG can matter as much as total testosterone.
A low result is usually repeated before a diagnosis is considered.

Important note

Lab reference ranges differ, and results need to be interpreted by a doctor alongside your symptoms and health history. Learn about the bulk-billed testosterone blood test or common low testosterone symptoms.

Not sure where you stand?

Take the free 2-minute ADAM questionnaire to check whether your symptoms are worth discussing with a doctor and whether you may be eligible for a bulk billed* blood test.

Frequently asked questions

What is a normal testosterone level for men?

Many Australian labs report an adult male reference range for total testosterone of roughly 8 to 30 nmol/L, but the exact range differs between labs and testing methods. Your doctor will interpret your result against your lab's range.

Does testosterone drop with age?

Testosterone tends to decline gradually as men get older, but the amount varies a lot between individuals. Health factors such as weight, sleep and chronic illness can have a large influence.

Are there separate normal ranges for each age?

Most labs report a single adult range rather than separate ranges for each age group. Some doctors consider age when interpreting a result, which is one reason results need a doctor's interpretation.

Is a result at the low end of the range a problem?

Not necessarily. A result has to be considered with your symptoms, repeat testing and overall health. Only a doctor can tell you what your result means for you.

Testosterone levels by age