Some joints, such as the knee, elbow, and shoulder, are self-lubricating, almost frictionless, and are able to withstand compression and maintain heavy loads while still executing smooth and precise movementsThe 10 Effects of Aging ChangesPeople lose bone mass or density as they age, especially women after menopause.

Bone spurs caused by aging and overall use of the spine may also form on the vertebrae.The foot arches become less pronounced, contributing to a slight loss of height.The long bones of the arms and legs are more brittle because of mineral loss, but they do not change length.

This makes the arms and legs look longer when compared with the shortened trunk.The joints become stiffer and less flexible.

This decrease is partly caused by a loss of muscle tissue (atrophy).

The speed and amount of muscle changes seem to be caused by genes.

Lost muscle tissue may be replaced with tough fibrous tissue.