How do I become immortal?

It's always been my highest priority to find a way to become immortal. Of course the most popular lore concerning this is becoming a vampire, but it doesn't have to be that for me. I also don't want to be like in a wheel chair living forever, so I guess I mean "eternally youthful." If you know a way and don't want to post it publicly, email me at poisonoid@yahoo.com