StudioClassroom: Who Are You Calling Old? Old is all relative. When you think a man with age 50 is old, you may change your mind when you’re 50. The keys to keep young physically and mentally are: * It’s never too later or too early to keep your body fit by doing excise everyday. * Make a plan of every stage of your life and focus on the goal when you come to that stage. * Enlarge your interest to the world or knowledge and keep life time learning.