The term for loss of bone density as one ages is known as osteoporosis. This condition occurs when the body loses too much bone mass or does not produce enough bone, leading to fragile bones that are more susceptible to fractures. Factors contributing to osteoporosis include age, hormonal changes, and insufficient intake of calcium and vitamin D. Regular weight-bearing exercises can mitigate the risk of osteoporosis, emphasizing the importance of maintaining bone health through proactive lifestyle choices as one ages.