The most important years for building good solid bones are from adolescence to about age 30. With good habits, you can increase your bone mass by as much as 20 percent during this time, says Dr. Kim Templeton, associate orthopedic surgery professor at the University of Kansas.
Your body stops adding bone by age 30. Now is the time to concentrate on keeping what you have.
Once you pass menopause, estrogen levels fall sharply, and so does your bone mass -- up to 20 percent within seven years.