This one is a bit of a double-edged sword. Generally, exercising is going to make you look younger. "Exercise provides proper blood flow to all the organ systems, including the skin," says Rokhsar. Aside from helping your skin, it can also keep your muscles from deteriorating and may even slow the onslaught of graying hair and balding. However, losing too much weight can give people a hollowed-out appearance that makes them look older. The advice: Make sure to implement a balanced mix of cardio and weight training