: Deterioration of cartilage in the thumb joints, especially the basal (CMC) joint, can cause pain, stiffness, and sometimes a change in the thumb's contour. Health and Mobility Considerations
: An overuse injury affecting the tendons on the thumb side of the wrist, which is most common in individuals in their 40s and 50s. skinny mature thumbs
: As we age, the small muscles at the base of the thumb (thenar muscles) can lose mass, leading to a more sunken or "skinny" look. : Deterioration of cartilage in the thumb joints,
: Thinner, less elastic skin—sometimes called "crepey skin"—makes the underlying bones and tendons more prominent, contributing to a slender appearance. especially the basal (CMC) joint