I think it’s less about older=conservative but more about making the younger voting block something politicians have to cater to.

If you don’t vote, they don’t try to take your interests to heart as much as the people who do vote. Why bother catering to people who won’t get you into office? It’s wasted effort.

This is partially why you see people who talk about issues old people care more about, like social security, than things younger people care about, like how the fucking earth is on fire and if we don’t fix it no one will have a planet anymore.