As I write this post, the song "Forever Young" by Alphaville is playing on my iPhone. Do you really want to live forever? There are many dimensions to this question, if you think about it. Does it mean that you physically stay on earth forever? How old will you forever be? Will you be completely healthy?
Then there is another dimension. What if you could live forever, but not physically, but in the hearts and minds of those you leave behind? I think that is when you truly "live forever".