[vkou]

My grandfather is 89. He can't walk very far, he gets tired very easily, and he has arrhythmia - yet he is still very strong, and very active. Most days, he gets up at 5, works in the garden, or the woodworking shop, or on property maintenance, finishes up by noon, and watches television until evening. This has been more or less his routine for the past 13 years.

If you remain active through your life, I think you're much more likely to stay active as you're older. I intend to retire by 40, but I don't intend to be idle.