Final answer:
The normal loss of bone that occurs with aging is called osteoporosis, which leads to weakened and brittle bones due to an imbalance between bone formation and resorption.
Step-by-step explanation:
The normal loss of bone that occurs with aging is called osteoporosis. This condition is characterized by the bones becoming weak and brittle due to an imbalance between bone formation by osteoblasts and bone resorption by osteoclasts. Factors such as hormonal changes, like estrogen reduction in women post-menopause, calcium and vitamin D deficiency, genetic predisposition, sedentary lifestyle, smoking, and alcohol consumption can contribute to the development of osteoporosis. To reduce the risk, a healthy diet rich in calcium and vitamin D, along with regular weight-bearing exercises, is recommended from childhood for maximizing bone mass before the age of 30.