Would this be possible too?

I've been researching frequently and recently and I've discovered that not too much into the near distant future,we could train ourselves and change our genes to live to 200 years old! But one thing that seems stuck on my worries is youth. Now I don't mean STAY 16 persay but LOOK and MOVE like you're still 16 or in your 20s. Like being able to compete in sports and STILL physically accomplish things like you're in your prime,even when you're crossing to the point of being 100. It'd give a human enough time to accomplish the things it wanted to do and actually give people a feeling that they fulfilled all that they could've fulfilled in their days of youth instead of saying "I'm so old, I missed out on my young days" etc. because in my opinion that's a true tragedy. You think being youthful by sheer genetic advancement and self discipline could happen? Considering the high possibilities of living to 200 years old? Think about this one for a minute,guys,it's a good theory.