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.

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 ...

Starting around age 40, many men notice the first physical changes that may be related to their hormone levels: Energy wanes ...

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

The Trump administration and Health and Human Services Secretary Robert F. Kennedy Jr. are flipping the pyramid upside down.

Numerous factors -- including body mass index (BMI), lifestyle, relationship status, and a number of disease states -- were tied with declining testosterone levels in men over 70, researchers ...