Excuse for an old joke

It's a bit late for me - my time in my 50s is coming to a close. But The Guardian reports:

Men in their 50s who increase their exercise regime live more than two years longer than couch potatoes of the same age, a new study shows.
Males in their middle years who do a lot of physical activity, equivalent to three hours a week of sport or heavy gardening, can outlive their sedentary peers by 2.3 years and moderate exercisers by just over a year, researchers found.

Anyway, it's not true that exercise prolongs life - it just feels that way.