AIBU to worry my retired parents never want to go out?

I used to socialise and do fun things with my Mum a lot too (spa days, shopping, theatre)

What would your Mum say if you told her you missed doing those things with her?

I missed where the OP said they walk the dogs, so obviously they are getting exercise. They are not isolating per se, but prefer to stay at home.

I am about the same age as the OP's parents. When I am not working over the summer, I go into "slug" mode. I prefer to stay home and read a book or watch a TV series at night. I can't be bothered to go out and could stay inside for three days straight. I do socialize, but more out of obligation rather than desire. I am not sure if it is healthy, though, being slug like. Work keeps me active.

My parents are in their 60's and still go on holiday - recently they have had a couple of short midweek breaks whilst the weather has allowed and before the schools break up. My Dad has always been more enthusiastic about going away than my Mum, who needs to be persuaded more. They have a dog which keeps them active, and my Uncle looks after the dog if they want to go away and can't take him. My Dad is 70 next year and my Mum the year after, as long as they are in good health I'm sure they will continue to be active.

I feel like it’s not really any of your business. I don’t mean that rudely but they’re not asking you for anything, you still see them, but they’re happy at home and that’s okay. A couple of hours with my adult children is enough for me too.

It is. This summer the weather has been perfect for this.

But I forgot to add the most important item; noise cancelling headphones, as I do have neighbours with kids - in case they are out playing.

This 😅

Do they garden? My PILs had an elaborate garden and worked in it all day every day that it was fine. Gardening can be a very healthy mental and physical activity and very satisfying.

You'll be more able to avoid it though.

Sun lounger, garden, good book and wine. Sounds bliss.

They're not isolated. They're just not doing what OP thinks they should be doing.

If you read her posts she says they rarely watch TV. They look after the OPs kids one day a week. They garden, walk their dog several times a day, potter about the house pleasing themselves, see friends once a month, go to tea at OPs house and host teas for her, her DH and their kids too.

They're fine and happy. But as OP thinks they're wasting their final years living how they want to and she couldn't possibly imagine living life like that, she's judging.

Of course, it's normal. Anything is normal. Each to their own I say.
Good for your nan! However, my mum is early 80s and after a horrific fall she's housebound and unable to go out on her so we take her places. Not everybody's the same and that's absolutely ok. Stop with the judgement please.
Some people are homebirds and others hate being at home. Whatever floats your boat.

Edit

Do they go for a walks or attend an exercise class to keep healthy?
Are they hard of hearing? If you can't hear properly you tend to isolate because it is so much effort to talk to people.

That. And OP sounds like one of those people who judge other peoples lives if they aren't like the OP. And lack imagination and empathy.

OP thinks them being retired and not doing what she thinks they should be is 'wasting their final years"

Hopes they're happy but 'couldn't possibly imagine being happy living like that'

Judging them spending the day at home with her DC as she would find it IMPOSSIBLE to stay at home with her DC all day.

It's quite sneering dressed up as fake concern.

I think its very normal. They are doing what suits them and when. When you get to a certain age, peace and quiet and chilling is a luxury. I wouldnt worry too much as they do make an effort to see friends.

Having re read the OP post I think you could well be right there.
And it would explain why her parents are defensive when being questioned about what plans they have for going out/away etc.

Years ago going out midweek in particular was easier. And ditto non school holidays. Fewer people about. One of the perks of retirement. Quieter, more restful, less traffic. Easy to get a table in a pub.
Queueing to get a car parking space wasn’t a thing.
It is not like that anymore. Everywhere is busy to sometimes chaotic.

But also, they might just not tell you all their comings and goings. And want some privacy.

Have you ever heard of disengagement theory op? It’s a natural process of ageing.

Are you aware that some people are introverts? that are happy in their own company? and they don't need to go outside, meet other people constantly?

If think is secretly annoyed her parents don't take her toddlers out and so has disguised the thread in other ways.

Very fortunate to have parents locally who will mind two toddlers, now wants to dictate what they do also.

I'm early 60s. Mostly I don't really want to go out. I've never been super sociable but I would always go out at some point during the day. Would take myself off to the beach, to town, go shopping, for a walk.

I don't really want to anymore. I'm tired after a lifetime of work (still working now, just from home). Even the things I like to do feel like too much now. So I can identify with your parents.

Used to love travel. The thought of the upheaval of getting to an airport, the chaos at the airport at either end, the horrible cramped planes (they didn't used to be as bad as they are now), and all the really loud, in-your-face people, is just too much now. As much as I'd love to be on a (quiet, only a few other people) beach, all the rest that goes with it would probably give me a heart attack.

For some of us, tolerance levels go right down as we get older. I don't think it happens to everyone, but it does for some.

I also think covid had an effect. I didn't realise I was OK in my own company, in my peaceful home without others until covid. It broke me of the ability to socialise I think.

My DF’s world got smaller and smaller as he aged. His evening meal got earlier and earlier to where he was eating at about 4pm and going to bed at 7.30pm. He’d have anxiety when he had to go to the supermarket or for an appointment. But he seemed happy in his little world,

Mine are like this too. They are very down and whingey about anything and everything but don’t seem to have the impetus to change. In laws are always off on cruises and things. I’ve tried and invited them to lots of things and suggested things I think they’d like but no joy, I’ve given up a bit with it now tbh.
it does rankle me though, I work such long hours and think if I had a fraction of the free time they have and was in good health I’d want to go out and do things and not be so negative.

On a serious note though when did their behaviour change, upon retirement or something else.