Scientist believe within 30 years some will live forever. As of now bodies break down and physical bodies have difficulties such that I believe it's going to be impossible to reach the dream of many scientist to acheive eternal (physical) life. I also believe that this is one of those endevours that is destined to fail miserably for the same reason that the tower of Babel failed (if you believe the Biblical account of it).
Let's say if it was possible to extend a person's physical life indefinitly would you really want such? Essentially it would be feasable for only a very select few such as Jeff Bezos and Bill Gates or Warran Buffet or anyone who had accumulated enough funds/money so as to be able to maintain their lifestyle for however long their physical life shall last. In order for such to work, also, every aspect of a person's life would need to be perfected and manipulated else it could very well be a miserable life or existance for that person.
The reason that I say such a procedure would be for only the ultra rich or wealthy is because if it was implemnted for the average citizen or person then it would mean society would implode/explode at some point unless there were ways implemented to provide for people who were living much longer and also population limitations put in place to restrict the number of people because at this time we are dealing with limited Global resources.
Then think of such a technology being available to someone like a Hitler or Stalin type dictator or even Kim Jung Un or the like and how much damage such a person could do with unrestricted life and how much more ruthless would they be to insure they kept it?
Some religions already teach and believe that eternal life exist only that eternal life isn't eternal in the physical body but is a spiritual spirit/soul existance. So some religions teach that there will be eternal life and some will live eternally in a paradise setting whereas others will live eternally in torment. Still others believe in three options. Eternal live in paradise, eternal life in torment and death to the spirit/soul after a person's physical life is lived. So one might take from the story, linked to in the first sentence, is that some people seek to live eternally or find this a positive thing yet, at least for now, it is a matter of faith and quite possibly those that seek to live eternally may very well be looking at doing just that very thing only past the point of physical death of the physical body.
I, for one, looking at it from a human, physical body, perspective don't see living eternally as a positive thing because there is not a perfect physical body that doesn't age or decay or become damaged and until the point in time where the physical problems assocaited with the physical body are overcome the prospect of living eternally or forever, I believe, is not a positive thing.