How to live forever?

And by forever I mean at least 200 years.  Maybe 1000 if I'm lucky.  These anti-aging supplements only do so much to prevent oxidative damage.  Growth hormone injections might keep you going for a little while.  Beyond nutrition I'm looking for a way to make DNA ignore that cells have to split a limited number of times in one life.  I don't want my cells to stop splitting, but I also don't want cancer. 

What happens when parts of your brain need replacing? Wouldn't eventually your brain be composed of stuff completely different from what it began as and you essentially be a different person. I know by that logic I am not the same person I was 10 minutes ago, but we don't know.