Life extension is a catastrophe without a comprehensive re-ordering of society.
Firstly, you and I probably won't get radical life extension, millionaires/billionaires will. As is currently, at least they die at roughly the same pace as everyone else. And that means them getting to live for many decades more, squatting on a titanic proportion of human wealth. And even if life extension does eventually become cheap enough for the masses, what that means is that we just have to slog our guts out on the daily grind for even longer. And you think we have a problem now with the economic and political power of society being with the old and denied to the young?
The whole idea stinks of these greedy, power-mad arseholes indulging their fantasies. With a nice, broad dash of that sort of "move fast and break things" ideology that they don't remotely believe in when the thing that threatens to be broken is them and theirs.