In Billy Baker's book "We Need To Hang Out", which is about trying to fix his lack of social connection as a middle-aged guy, he eventually realizes (spoilers!)

In Billy Baker's book "We Need To Hang Out", which is about trying to fix his lack of social connection as a middle-aged guy, he eventually realizes (spoilers!) that he should stop trying to reconnect with his college friends who are now widely scattered and instead focus on building new connections with the men around him -- that guy at Pilates who seems friendly, or a father of one of his kids' classmates. It's fun to revisit the college friends again, but they just can't be around for the week-to-week.