Apparently this might actually happen in my lifetime. More and more I'm hearing about drugs that target senescent cells. Destroying these "Zombie" cells prevents a lot of the harm of aging apparently.
I think if any of it was working noticeably well we would already know (unless its some super secret formula only for the rich). But it is an interesting concept. Some think you might be able to get about as healthy as you were at 25 -- right up until you are about ready to croak.
Link to article that predicts all kinds of legislative problems. How is the insurance industry going to coup? etc...