Now that I actually talk some with random people my age (I think this change of opinion started slowly at age 18 after having gained earnest friend- and acquaintanceship), I prefer peers above all else. (I don't have social phobia if that is important.)
Younger I can't stand because their childish antics will make my ears bleed, older alternatively bore me and anger me too much for treating me horridly.
I get along best with peers now. That's to say, "getting along best" means most peers dislike me greatly but some are okay with me, even enjoy my company.
People of all ages met personally who I don't know bore me beyond small talk however. I am not keen on making new friends if it can be helped.
Games with strangers can be fun, I don't mind them (and plainly, I occasionally enjoy making people looking silly too much for the excitement) but beyond that, I'm out of it. I worry about entering university and having to behave in a nice, normal way to avoid being singled out when seriously, I don't go there with the plan to get social and form relationships unless someone exciting happens to cross my way.
I can't fathom that I'll be be anything but bored and exasperated by having to make more than fleeting acquaintances out of all those strangers, a lot younger and older than me too.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett