Mums husband suddenly angry

[GnomeDavid]

I will start off by saying I really like my stepdad. They have been together ten years. He retired about 7 years ago at 55.
My mum is 62 and still working full time. She is very active, fit and mentally enjoys her job.
In the last year, my stepdad has been grumpier and losing his temper more and more. I think he might have the start of something cognitive.
He gets very snappy at my mum when she is in his way, or tries to help or gives advice. He also gets angry at systems he doesn’t understand like pay at the pump or anything with technology.
Recently he was talking about my mum in quite a negative way and said ‘well she messed it all up when she decided to keep on working, she was supposed to be retiring at 60 but she didn’t want to, so she messed up my retirement, I’m just wasting my life waiting for her now’. There was nothing light hearted or loving in the way he said it.
It makes me wonder how he is when I’m not there and if there is this simmering resentment. Is this really it for her now? Does she just have to stay and watch him get angrier and more short tempered? What if it is dementia?
Do I speak to her about it?

So he's only 62? Dementia seems unlikely- more like boredom. Can he go back to work?

It sounds like your stepdad might be depressed rather than the start of dementia but your mum might have noticed symptoms that you're not aware of. Retirement can be a trigger for depression, especially if your stepdad doesn't have hobbies and interests that fill his time and he feels like he's sitting there waiting for your mum to come home.

That. I don't know why so many mumsnetters jump to dementia as soon as a parent hits 60.

Older man grumpiness is a thing. Men not coping with retirement is a thing.
He's bored in retirement, and his wife didn't stick to the plan he thought they had. He's lost, lonely , bored and frustrated. And yes, possibly depressed.

He needs to work out how to entertain himself instead of expecting her to be his entertainment. I can see why she's wary of being stuck with him full time if he doesn't take the initiative to do anything interesting for himself.

Can they actually afford for her to retire early? I would have a private conversation with her about all this.

I think they can afford it. I’ve not asked about their finances.
Depression and signs of physical poor health are also good shouts, he does go to the doctor lots though, due to high blood pressure.

Ooh why has this touched a nerve with you? Very interesting.

Whats a grown ass woman? Is it related to ones bottom or a donkey?