After which average age does an adult's height begin to decline?

The decline in adult height is a physiological change that generally begins after a certain age due to various factors like the aging process, loss of muscle mass, and changes in the structure of the spine. Research indicates that this decline often initiates around the age of 30.

After 30, the body starts to lose bone density and muscle mass at a gradual rate. In addition, postural changes and the compression of the spinal discs contribute to a noticeable decrease in height. As a result, choosing 30 years as the starting point for height decline is supported by numerous studies examining the effects of aging on physical stature. This understanding is valuable for comprehending the aging process and its impact on health as individuals navigate their later years.