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 ...

What exactly makes a woman? Track and field's world governing body thinks the answer has to do with levels of serum testosterone, at least when it comes to female runners competing in middle-distance ...

Many women are becoming more aware of the perks of maintaining their hormone levels as they age. Maybe that’s why testosterone is no longer the third wheel—after estrogen and progesterone—when it ...

Testosterone is being sold as the missing hormone for midlife women. Except there's no FDA-approved female dose, so sourcing and dosing has become the Wild West. How did we get here, and what comes ...