Preferring to be alone more and more as I get older

[alovelysunnyday]

Married 25 years, 3 teen DC
Am I depressed or just used to my own company ? I am happy pottering around at home/going for long walks/mooching in the shops/sitting in my garden in the sun/running/swimming/organising the house.

When I was 18/19 I had very few friends and would go clubbing alone. As I've got older (40s +) I have been part of a group of friends. We don't see each other that much now due to life. I think from my time when I was younger with almost no friends I am used to be alone, apart from DH. He has loads of friends and could be out every night. I'm happy for it just to be me and my DH, a good friend who I see once a month and a couple who me and DH have drinks with every few months.

Gosh no, YANBU at all. At this very moment DH is away on a work project for two weeks and I'm in the sunny garden on MN reading.
I like doing all the stuff you mention. Plus I've blitzed the house. I feel I can breathe when I'm alone in the house. Plus if I want to eat my evening meal at 4pm or get up at 11am I can, etc etc.
I am nearly ready to see him again though!
I have a small group of friends I see about once a month and a couple of others I regularly go for walks with. That's it for people I call friends, rather than acquaintances.
Edit: I'm recently retired. But I've always been a bit of a loner. Like meeting people but really need time to myself.

I’m much the same - need a lot of quiet time to myself - and do get ‘peopled out’ easily. I’m OK with socialising as long as there are plenty of ‘rest days’ in between.
I’m retired so it’s reasonably easy. Dh is rather more sociable but is happy to do his own thing much of the time.