You know what they say, if you're not a liberal at 20, you have no heart, and if you're not a conservative by 50, you have no brains.
My point was moreso that in the US at least there is a pronounced difference in political affiliation based on age. Notably, that is an old quote, it just seems interesting it holds up.
It's saying that a 20-year old conservative is necessarily heartless, and a 50-year old liberal is necessarily stupid. I don't see how either of these follows; I know plenty of young conservatives who care deeply about other people, and old liberals who are very smart.
It's just a lazy meme.