Well I guess it depends on what the person seeks when they are attempting a relationship.
For me, what I seek when attempting any relationship is growing with the female of my choosing toward being the best people we can possibly be. Now with that said, I don't think it would be the best approach, at least for myself (im in my early 20's), to attempt that with someone who is in their late-40's or with someone who just turned 13, but rather with someone who is very close to being or at the same age as myself. A lot of the times relationships with wide age disparities end up producing a parent/child dynamic between both partners. I could be incorrect about what I'm saying, but that is currently the logic I follow when it comes to age disparities and attempting relationships.