What is testosterone deficiency?
Testosterone deficiency is a combination of symptoms plus consistently low blood testosterone levels. Leading guidelines recommend diagnosing Low T only when both criteria are present: relevant symptoms and two separate low morning testosterone tests using reliable assays.
How common is Low T with age?
Research suggests about 20% of men over 60 and up to 50% over 80 have total testosterone below the reference range. Levels tend to fall gradually with age.
