Earlier quoted context omitted.
I think his point is that "old people" won't live with the outcome of their votes. It's not a generally correct point, but it makes sense from the perspective that they don't have skin in the game.
Right, all old people are for killing their children. It's almost like black and white statements are just bad stereotypes.
Are they malicious? Maybe, maybe not. But at the end of the day it doesn't matter if they're malicious, senile, or just plain old apathetic.
(Perhaps you can find a political issue for which young people throw caution to the wind and old people exercise appropriate caution, but I can guarantee you that the impact of that issue will not be as severe as climate change.)