On a physiological level, the aging process is difficult to fully generalize. Physical activity, dietary choices, skeletal blood flow, and endocrine function helps dictate how rapidly you experience the effects of aging. Bone density typically peaks around 30 years old. However, bones adapt to the stresses that you placed upon them. For example, astronauts often show a decrease in bone mineral density and tensile strength due to periods of zero gravity. This puts into perceptive the importance of following a well-designed resistance training program to improve bone mineral content. Training for strength, therefore, is invaluable for the maintenance and improvement of bone health.