i don't particularly care about age differences but i do like certain dynamics that mostly younger LIs (or ones considered the same age) give! i don't project onto the MC and everything is fiction so that's probably why age doesn't matter and i see all characters as their own self. cute is justice, but it has to be a certain kind haha. like, not a child but boyish... if that makes sense? ie. in ayakashi gohan, i like yomi! maybe i'm just a fan of the mc teasing/li being teased dynamic haha. you definitely see less of that with older LIs