Aging impacts muscle mass and strength through a process called sarcopenia, characterized by a gradual decline in muscle tissue and function. Hormonal changes, decreased physical activity, and shifts in nutrition contribute to this loss. This decline generally starts around the age of 30, leading to reduced strength, which can affect mobility and increase frailty. Engaging in regular strength training and maintaining adequate protein intake can slow down or reverse these effects, preserving functional strength and enhancing overall quality of life as individuals age.