Age affects muscle mass and strength as individuals naturally experience a decline in muscle tissue and overall strength, starting as early as their 30s. Known as sarcopenia, this process can lead to decreased physical function and increased risk of injuries. Regular strength training, proper nutrition, and active lifestyles can help mitigate these declines, promoting healthier aging. It is essential for older adults to incorporate resistance training into their routines to maintain and build muscle strength, enhancing their quality of life and independence.