Chris notes two very interesting studies which look at the impact of exercise on older adults – Cardiovascular Aging and Exercise in Healthy Older Adults and Is Regular Exercise a Friend or Foe of the Aging Immune System? A Systematic Review. One of the conclusions from the first study neatly sums them up :
Age is not a contraindication to exercise, which can usually be initiated safely in older persons.
It’s never too late to start.