I too would like to live forever, but one problem I see is that if you just extend peoples physical age but their minds become frozen in time, then all progress stops. It is well known that as people age their neural plasticity degrades and they loose the ability to learn anything new. I have observed this with my Dad who is 84. If people lived to be 1000 but their neural plasticity was gone by 120, we would still have slavery, women would not be able to vote and we would still be riding around in horse and buggy. There has been a lot of speculation that progress in technology or society or both has slowed are stopped. I think if true, it is likely due to an aging population. In addition to slowing the physical aging process, there would need to also be a way to somehow maintain peoples brain function, including neural plasticity.