Testosterone changes over a man’s lifetime. That basic fact has contributed to a massive market for hormone testing, anti-aging programs, and testosterone treatment.
But understanding testosterone levels by age requires more nuance than comparing a laboratory result with an online chart.
Testosterone Generally Declines With Age
Testosterone production is usually highest in early adulthood and tends to decline gradually later in life. But a normal age-related change and clinically meaningful testosterone deficiency are not necessarily the same thing.
Reference Ranges Vary
A laboratory report normally includes a reference range, but ranges are not universal. Different laboratories may use different assays or reference intervals. The Endocrine Society recommends accurate testosterone assays and rigorously derived reference ranges.
Symptoms Matter Too
Clinical guidance recommends diagnosing hypogonadism only when compatible symptoms or signs occur together with unequivocally and consistently low testosterone measurements.
Fatigue, reduced libido, decreased exercise recovery, mood changes, reduced strength, and increased body fat can have many causes.
Repeat Testing Reduces Guesswork
Testosterone fluctuates over the course of a day. MedlinePlus notes that morning testing is generally preferred, while the Endocrine Society recommends confirming a low result with repeat morning testing.
Age Should Provide Context, Not a Prescription
Two men of the same age can have different symptoms, health conditions, medications, and laboratory results. The appropriate path is to determine whether a diagnosable condition exists and whether treating it is likely to provide more benefit than risk.
Medical review: Adam Russell, PA-C, Hormone Balance Centers.