Think of it this way. When your husband was working, you were sort of “equally busy” - him with his job, and you running the household, raising children, caring for grandchildren, etc.
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The scales have now tipped. He isn’t working, yet what you’ve been doing hasn’t changed.
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Time to even out the scales again.
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When DH and I first (borrowing a phrase from
@barkley) began ‘cohabitating’, we were both fairly busy. He was rising in his career and I was still in school and getting started with my own. Crazy busy time. We just equally pitched in for whatever needed doing, and we’re still doing it pretty similarly 40 yrs later. There were times that one of us had a heavier load, but it was usually transient when something was happening, like an illness or transition. We call it a tag team. I mean, I still might not be 100% happy with the way he cleans out the fridge or misses some dog hair when vacuuming. And he might get irritated that I came home and forgot to bring the barrels in (and they were blowing in the roadway) or I didn’t refill the Keurig water when I drank the last cup (not true, really, lol, but he says it all the time) and that’s natural any time people live together, I think. But generally we both get the job done and then we can both sit and relax a bit. That was important to me in life because I watched my mother pretty much do it all and felt it was unfair.
You can take baby steps - it doesn’t all have to change tomorrow - but you should try to cut back a bit (since you’re retired now!) and let your husband pick up a bit at the same time. If he doesn’t want to do it, he doesn’t have to, but neither do you, either. Just let it go, then. But hopefully he can see something needs to give, and now that he’s not working, he can do more with you around the house. Good luck!