Age significantly affects muscle mass and strength, primarily due to changes in hormone levels and metabolic rate. As individuals age, they often experience a natural decline in muscle mass, known as sarcopenia, which can lead to decreased strength and mobility. This process can begin as early as in the 30s and accelerate with age. Regular resistance training, combined with adequate protein intake, can help counteract this loss and maintain muscle function. Understanding how age interacts with muscle health is essential for developing effective exercise strategies across the lifespan.