Final answer:
The number of bones in the human body does not change with age, but bone mass can change. Bone mass generally peaks in the thirties and then decreases, especially in females after menopause. While bones stop growing in length after skeletal maturity, they can still increase in thickness.
Step-by-step explanation:
The number of bones in the human body does not change with age. The adult skeleton is composed of 206 bones, which remain constant throughout life.
However, the bone mass or density can change with age. Bone mass generally peaks in both males and females when they are in their thirties. After that, it tends to decrease, especially in females after menopause, due to low levels of estrogen.
It is important to note that while the number of bones remains the same, bones can still change in other ways. For example, during skeletal maturity in the late teens or early twenties, bones stop growing in length but can still increase in thickness in response to factors like increased muscle activity.