Those were lives well lived and a lot of the meaning and wisdom now derived from their lives is because they are gone. Same can not be said for the multitude that just wants more time.
It's also a damned shame that my grandfather, who is precisely nobody on the world stage, but still somebody, and currently in the hospital and I might get a text any minute saying he's dead, is on the brink of exiting the world, joining the hundred billion or so other humans who've ceased to exist for no good reason other than that the blind god Nature doesn't care about anything we care about. What Nature has ordained, she has ordained without reference to meaning or wisdom or the interests of those who live and die within her system, and we will be doing right when we remake her.
I'm sorry for your eventual loss but immortality does not appeal to me the way I guess it appeals to others. Cycles in nature don't seem like a disease to me that need curing. Alleviating the pain and suffering of aging is fine and that's what these guys seem to be doing.