Here is an interesting article from BMJ (it is almost two years old – but still relevant) – BMJ 2005;330:189-191
It states: “Regular physical activity brings important health benefits at any age. Its importance for health in old age is highlighted repeatedly in the English national service framework for older people. Any potential hazards can be reduced by education and guidance of participants.”
See the full text here
* photo courtesy – sparkle glowplug