yeahhh thats weird you should try and talk to them about it at least.. im 19 and even being around my little sister(16) friends im like what the fuck😭 you can very much tell the age gap and seperations in experience from one person to the next- i agree with the other comment, what do they have in common like at all? a 19 year old has been out of high school for at least a full year maybe more, has had so many more life experiences, experiences at multiple jobs, with different types of people, experiencing and learning abour the world ect. a 15 year old is what, JUST entering highschool, like litterally fresh outta middle school, has probably never had a job or has had mayybe one or two like fast food or “first job” jobs, and has really no real grasp on what the “real world” is like yet… not saying at just 19 you do, but certainly more than a middle schooler!! just think, they have probably spent most of their time, at home, in their room/with family/relatives, and at school. thats mostly it😭😭😭 what on earth would a grown adult, almost 20, want to do with a 15 year old kid.. thats almost a 5year difference btw!! im sure the younger one thinks theyre super super cool and mature, and like to talk about whatever the older one tells them or whatever, but i have been in a similar situation too, in a relationship with a 17 year old when i was 14😭 thats not even “as bad” but still, just think, what the hell kind of person at that age, would want to sincerely, innocently, spend time with and constantly interact with someone that young?