Answer: Bbased on the normal development of bone density and the age at which peak bone mass is typically achieved, the correct answer is C) 21 years.
Step-by-step explanation:
Peak bone mass refers to the highest level of bone density and strength that a person can achieve in their lifetime. It is an important factor in determining bone health and reducing the risk of osteoporosis later in life.
Peak bone mass is typically reached by the age of 21. During childhood and adolescence, bones undergo a process called bone modeling, where new bone is formed faster than old bone is broken down. This leads to an increase in bone density and size.
The period of puberty, which usually occurs between the ages of 10 and 14 for girls and 12 and 16 for boys, is a critical time for bone development. The hormonal changes that occur during puberty, such as increased levels of estrogen and testosterone, play a significant role in promoting bone growth.
After reaching peak bone mass, bone remodeling continues throughout adulthood, but the rate of bone formation gradually decreases and becomes balanced with bone resorption. As a result, maintaining a healthy lifestyle, including regular exercise and a balanced diet rich in calcium and vitamin D, becomes important in order to preserve bone density and minimize age-related bone loss.