Men often desire more and better friends. A man in his 40s with five kids will have a harder time with this than a man in his 20s who’s a college student, just on the basis of competing priorities and responsibilities.
There’s a reason Billy Baker wrote in The Boston Globe that “the biggest threat facing middle-age men isn’t smoking or obesity. It’s loneliness.” The fraternal connection of the college fraternity turns into an impersonal connection with your supervisor and an adversarial relationship with your teenagers and their need to be driven all over town. Taking the next step toward being and feeling known and loved feels like you have to give less time either to your family or to your work.