It's about new studies that prove that even if you are among the "oldest old" exercise can lengthen your life.
It's just one more proof that it is never too late to start something for yourself!
The great news is that even taking a few 15 minute walks counts as exercise.
If you are concerned about personal defense, you should also be interested in personal fitness. I offer you this article as inspiration to get out there and MOVE!
FYI - The old man in the picture is Helio Gracie - patriarch of the world famous Gracie Jiu Jitsu family - choking out a much younger Royce Gracie. What's your excuse?