I'm 37 with a wife and two kids. I'm fortunate that I see friends quite often. Several times a week, actually.

It's so important to schedule time for socializing as we get older. We can't take it for granted like when we're young; it often needs to be planned in advance. Being a member of a religious community or special interest group more or less guarantees that there's always a social event coming up.

I highly recommend guys who are feeling lonely to look into local groups according to their interests. You'll be surprised how many other people also want friends outside of work but don't know how to get it started.