I think that if we had the ability to live forever then we would just do whatever we would of wanted to do if we didn't have a extended lifespan. Plus eventually we are going to have super immersive virtual reality where you could do pretty much anything you can imagine.
Secondly when it comes to asking people who are old if they wanted to live forever well I think you are phrasing the question wrong. Normally when you ask someone if they wanted to live forever (Especially if they're already old) they would take the question as if it meant that they get to live forever but with all the problems that come with old age. When asking the question you would want to emphasize that you're talking about expanding not just lifespan but ALSO healthspan. So the question would be do you want to live forever young? Then I am pretty sure the answers to the question would change dramatically.
By the way if you want to read more about achieving immortality through biological and also non-biological means than you should check out my post here:
https://steemit.com/sciencefiction/@digitalcosmos555/futurtopia-2-living-forever