Every Gen Xer I've ever met are the most apathetic people in the world. They do not give a single shit about what happens outside of their immediate vicinity, no matter what it is. The youngest ones are all middle aged now so they do the "when you get older you'll get more conservative" shtick to millennials and zoomers too.
I think the “when you get older you’ll get more conservative” is actually kinda true in western countries, but mostly because most people thinking that they're leftists in their youths are just left liberals, so when and if they eventually accumulate capital, they become less supportive of measures that would reduce inequality and create a socialist society, because their class interests as labor aristocrats might get threathened.
For actual leftists though? We have been a very small minority since the golden age of social democracy in the Keynesian era and the capitalist hegemonic ideology is extremely strong, so disappointment and burnout is very common among us and thus some of us embrace that the arguments we are told all our life like "it's not going to work anyway" start to ring true. Also, the western left is usually composed of educated people that can assume high-paying jobs, thus starting the same process of boomerification that happened in the 1970s and 1980s.
Eventually though, a socialist revolution will succeed in a place that will be strong enough to repel coordinated resistance from Bourgeois class interests and imperialist states' interests and humanity will be able to progress to the next stage of development.