Every single one of us can empathize with watching loved ones age and pass and facing our own mortality.
As of now, I wouldn't want to prolong life, but I'm sure that perspective may change if I have children/grandchildren.
It's interesting to think about. My problem is the obvious issues with execution if technology really does afford us this one day. If the rich/poor dynamic wasn't contentious enough politically, this would take it to new extremes. Scarcity of resources would be huge of course.
This is a bit too individualistic for me. For every wise elderly person I meet, I meet several who are products of questionable ideologies reinforced for decades. Give those people another thirty years while also legislating how many children we can have (this would definitely need to happen, no?) and we may get stuck with a lack of youthful innovation. I'm skeptical that we would be better off as a whole.
We've all been in the place of wishing we had just a little longer with someone. On an individual scale it's sad, but in broad strokes it's necessary.