What are normal testosterone levels by age? An older photographer mentors a younger one. Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical ...

Men's testosterone levels remain pretty steady until age 70. After that, production of the male sex hormone starts to decline, new research indicates. This begs the question: Is testosterone loss ...

Total testosterone measures the full amount of the hormone in your blood, while free testosterone represents the small, ...

Concept of longevity illustrated by clock with miniature old man figurine place on the hour hand. Maintaining normal testosterone levels is essential to feeling good and staying healthy as you age.

Testosterone is an important hormone. It helps men develop during puberty, and as they age, it plays a critical role in helping control fat levels, cholesterol, and glucose levels. Testosterone ...