The study aimed to understand functional hypogonadism (FH) in men, focusing on how age and metabolic factors affect testosterone levels.
It analyzed medical records from 5,374 healthy men and found that total testosterone levels peak at 18 years and decline until about 40, after which there can be a slight increase.
The research confirmed that specific metabolic factors negatively correlate with testosterone levels, suggesting that using age-specific cutoffs could enhance the diagnosis of low testosterone and FH.