Old dudes befriend 18 y/o girl is this weird?

My sister is 18 she's pretty, she always says she doesn't get along with her own age group though she has a few mates her age. She seems mature but she's quite naive, she used to hang out with a few guys between 30 and 60 years old and she did tell me one guy took interest in her and she had a little crush on him at the time. Out of the photos I've seen there would only be a few girls mid 20's.
She's known this group for roughly 5 months and after she moved states to live with me she gets messages from these guys quite often they are her "friends" but I can't help but think it's odd all they did was drink together and get stupid.
Old dudes befriend 18 y/o girl is this weird?
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