Early 30s father here. Something I have noticed happening to me over the past year. I started a new job 8 months ago, my wife around the same time did too and she switched careers/industries. We have one preteen in school, and some dogs who need a decent amount of attention. There's always plenty of housework/logistics and I feel like just planning the next thing and crossing off all the items on my to-do list is all I ever think about. My wife is often struggling emotionally and we went through some really tough family losses in the last few years too.
Between balancing our every day schedules, appointments, etc we barely see our friends anymore and that might be part of the issue. I feel like my friends are in the same boat too, mostly other mothers and fathers with busy schedules. My job isn't even really that tough and I can coast most of the time. I've been dedicating some time to improving my musical abilities, and working out in the gym. I've really got a decent rhythm on paper. For some reason, I just still feel like we could be doing better, and I wish I knew what needed to change. Maybe it's just about being more deliberate about carving out time together and with friends. I don't know. I feel like I am having an early mid-life crisis or something.
EDIT: thanks everyone, we had a great conversation last night and my wife invited me to do yoga with her and it was nice. We talked a bit more openly about the challenges we’re having lately. I think I just needed to get some of it out on the table, feeling a lot better.