This is the only actual answer itt so far, although I don't really trust the question.
Men tend to kill themselves a lot around middle age, and for poorer people, death rates from violence, disease, etc. tend to be higher. Age would already come with some general correlation with property accumulation and removal from the lower levels of the working class, but when you pair these factors with the additional factor of a ton of the less wealthy people dying off over time, you get numbers which will usually skew further rightward as more time passes. Fewer of the older people who would be discontent will live to be that old.
That said, this isn't set in stone, and you shouldn't mistake a statistical correlation between old age in the general population and right wing beliefs for "every old person is right wing." I've noticed that it seems like a lot of gen z'ers genuinely don't understand the difference.