The basic fact related to exercise is that, it is relevant and useful for everyone irrespective of age, gender and physical condition. It is quite likely that you became aware of the importance of exercise at an older age. You can surely initiate your exercise schedule when you are 50 years of age or even older. Your medical adviser can discuss suitable exercises based on your medical and physical condition. Take a few safety precautions, stay hydrated, do not over exert yourself and STOP exercising if you feel uneasy to breathe or concentrate. Seniors should try to join a local exercise group, such activity keeps your mind active, it also motivates you to keep going and more importantly, it increases the safety level. Herba Nutrin has more on this topic at http://www.herhealthplus.com/start-exercising-at-50-years-01-0220.php