I just spent a good amount of time talking to a therapist (first time) about how painfully lonely I am. I moved to the countryside because the city was too unaffordable but friends I used to see a couple times a month are now a couple times a year. And I just had my 40th where my wife invited one of her friends (another couple with kids) and it was nice, but it wasn't "my" friends, if that makes sense.
My days are wake up - get kids ready for school - work - come home and basically work nonstop dealing with kids (I love them but fuck they're a lot of work), pass out, maybe text an old friend or two, most of whom also had kids recently.
I suppose after your 30's anymore life is just lonely. Maybe it'll pick up again in a decade or so when I'm not getting summoned to wipe a kid's butt or screamed at because I used the wrong cup or plate but it doesn't really feel like it.
I'm hoping to at least move to a walkable city again. Leaving was a huge mistake I bitterly regret.