A bloke can't just go out and recreate a college environment at 30 for himself to socialise in - society is wealthy, but not wealthy enough for everyone to be a permanent student.
Fraternal organizations, adult recreational sports leagues, social dance groups, etc., all exist. You don't have to be a permanent student to have a slice of your time in a not-too-dissimilar social environment.
There is a need to build an environment where people can get together first, before they can make friends.
There are plenty of such environments. The people that aren't making friends are choosing not to engage with them. In many cases, because they are expending all their social energy on work and transactional relationships around work rather than non-transactional casual interactions on which to grow friendships.
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Fraternal organizations, adult recreational sports leagues, social dance groups, etc., all exist. You don't have to be a permanent student to have a slice of your time in a not-too-dissimilar social environment.
There are plenty of such environments. The people that aren't making friends are choosing not to engage with them. In many cases, because they are expending all their social energy on work and transactional relationships around work rather than non-transactional casual interactions on which to grow friendships.