I think that once all the people of my generation are dead, and all the people I can relate to, who had the same formative experiences I had are gone, I won't want to live much longer.
I think even if we engineer away death, you will still have the psychological structure from the "formative years" -- adolescence to early adulthood-- that sort of fundamentally make you personality-wise.
The songs and movies that gave you emotional experiences, the events that happened, etc. For me and my cohort it would be groups like Nirvana, Pearl Jam, Beck, and movies like Reality Bites and Pulp Fiction. These were the things that spoke to us as we were becoming adults.
It's not that those groups or movies mean much to me nowadays, but I feel that, socially, I am a peer with someone who lived through those years at the same age I did. It's not simply that we share the same cultural references, nor is it just that we happen to be the same age. I think rather that we were formed by the same events at that age and time.
If I live to be 230, I might feel somewhat disconnected from a 200-year-old, even as the age difference becomes relatively smaller and smaller, because that offset of 30 years made for a completely different formative experience. I'd still want to be friends with people who _get_ me.
My grandpa lived into his 90s. It got to the point where the children of his peers were dying. His main thing to do was read the obits and note how he knew that person. He had lots of family and friends, but no one could relate to his stories of old sports games, WWII, etc. etc. He was in good health and will mentally alert, but after my grandma died, it was just a matter of time. He died of a blood infection, no illness or anything.
So even if we can undo aging and death, we still might need to address the developmental process-- tweak it in some direction. Either have eternal formation, or re-formations-- something.