: Spinal discs can dry out and flatten, leading to a flatter lumbar curve. Additionally, reduced collagen production results in less "bounce" and increased sagging of the skin.

Changes in the buttocks can sometimes indicate underlying health issues:

: For those 45 and older, regular colon health screenings like the Cologuard stool DNA test are recommended for early detection of abnormalities.

: The gluteal muscles (maximus, medius, and minimus) tend to shrink and lose tone over time, a process that can accelerate after age 30.