Testosterone is one of the hormones needed for sexual development. Although testosterone is present in both men and women, it is considered a male sex hormone (androgen) and is produced in much higher amounts in men than in women. Testosterone helps a person's body maintain strong, healthy bones.
Testosterone levels slowly decline after age 45 to 50. A decline in testosterone at any age increases a man's risk for osteoporosis.
WebMD Medical Reference from Healthwise