That's hella sus as to why a 25 year old wants to be friends with a 16 year old. I guess maybe the younger individual might think it's okay but like it is not. If you want to be friends then sure. It's not illegal but still weird. The reason why it's weird is because a 25 year old is most likely out of school or in uni while 16 year old is probably still in school. They're not even in the same stages of life. Also, that's weird because it's highly unlikely a 25 year old has the same interests as a 25 year old. I mean, since most likely they aren't in the same stages of life and/or have anything in common so the only reason we'd think why someone that old would want to be friends with a younger individual is to groom them and/or try to abuse them. That's almost like a 15 year old going to grade school and hanging out over there without a younger sibling and hanging out just for fun to talk to children. Weird.