Another common sign that the body’s aging is its fatigue. This goes beyond getting more than eight hours of sleep every night. In our elder years, we can experience extreme lethargy that affects us all the time. Our muscles and joints could experience separate senses of fatigue, too. You might find that you can’t lift nearly as much as you used to. In addition, our brains experience fatigue, too. This is especially clear in older people who suffer from memory loss more severely in the evenings. They’re functioning fine during the day, but their brains get tired at night and sleep is needed.