The aging system of the musculoskeletal system includes:

The aging process affects the musculoskeletal system primarily through muscular weakness and bone brittleness. As individuals age, there is a natural decline in muscle mass and strength, a condition known as sarcopenia, which contributes to overall weakness. Additionally, bones can lose density and become more brittle, increasing the risk of fractures and injuries. This weakening of both muscles and bones can lead to diminished mobility and balance issues, which are critical concerns for older adults.

The other options mentioned do not pertain to the musculoskeletal system. Taste decline relates to sensory changes, skin breakdown ties to integumentary changes, and bleeding with bad breath usually indicates oral or systemic health issues, but none directly describe the primary changes seen in the musculoskeletal system as it ages. Focusing on the muscle and bone changes gives a clear view of what happens in the musculoskeletal system during the aging process.