I’m currently a student (21 y/o), and meet up with some three of them occasionally, and very rarely with a few others as well. Then there are a few I now and then (but quite rarely) meet in the streets, as where I’m studying now is not far away from where I went to high school, but those meetings are mostly awkward.
I remember hating the outlook of losing touch with all my high school friends after high school, but it really wasn’t that bad. You move on, they move on, and you still have happy lives, and if you go out of your way to meet up with the close friends you had in high school, that is great, but it’s not much of a trouble that it’s not that often anymore.