25 is when your brain finishes maturing, so it's when adulthood actually starts. The crazy thing is that we let people join the military, rack up credit card debt, etc. well before that age.
The flip side of that is so wild. Remember being like 12 and an 18 year old seemed so grown up? Now I see an 18 year old and...yeah that's a child, bro
These guys don't want somebody to talk to. They want to relive feeling that age again, but they also want somebody who doesn't have much life experience. Odds are, women their own age won't put up with their bullshit, and they want somebody who won't push back on them
Are you trying to imply that humans have a variety of personalities and experiences in life?! Creep! /s
Old/young relationships CAN be not creepy and potentially abusive but, like you say, they're few and far between. Better to try to be friends in most cases.