While planning the 40th a group of twenty of us created our own A list and have been in close contact ever since. I love my group - we email about this and that almost every day. We're a tremendous support system to one another and have walked together through losing a member through death, various parent and spouse deaths, challenges with children, grandchildren, spouses and exes, severe illnesses, etc. One member is transgender, several are divorced, some widowed, some married, some single.
It's a lot like SF but we knew each other (or of each other) back when we were young. No cyber hiding. Only a couple of the people were close friends back in HS. Most of us barely knew each other then, but we've sure become close in the meantime. Mini reunions, a few vacations together, staying at each other's houses, etc. We meet up whenever possible and however many of us can get there we make an effort to do so.
HS kids are much better when you add 40-50 years.