I am not sure why a few people are implying 55 is no age to retire? Surely anyone should been entitled to retire at the age they can afford to retire if they so wish?
I am in a similar though completely different situation to your DH, OP, as I am much younger than him (aka just entering my 30’s), but I am also semi-“retired” already (as in I only work 6 months of the year max, by choice) and in a relationship with someone younger (similar age gap to you).
For now the time off I have hasn’t been an issue as my partner still studies and we live in different cities so it’s actually been useful for me to have more time off + I currently pay for most things if not everything, but the reality is I can see the issue potentially arising as we will soon move in together and while my plan is to continue to drop working time (to be fully retired by the time I am 50) she is only getting started in her career and likely won’t have the same opportunity to only work a few months a year as we work different fields. So I can see how someone might begrudge having to work most days while the other doesn’t.
But personally I see it that way, when I do work, I work insane amount of hours, and ultimately I have worked very hard the last decade+ (started working at 17) to get to where I am at financially, and made many many sacrifices to get to live the life I live, and the way I do, including being mortgage free already (and owning a second property).
So while I could still work full time, I don’t want to because I don’t need to, and I do plan to stop working as early as I can afford to (not saying never working again, but only working when I want to, and IF I want to rather than because I must.)
Currently still working half of the year because I always want to make sure that I can afford everything for the both of us (if need be) + saving for having a child/ that early retirement I want.
I don’t plan on bailing out of finances or her having to pay for everything once I am “retired” but I do feel like I am giving her a massive leg up by her starting her career mortgage free, she will never have to pay rent while with me, (and anyway the goal is that everything that’s mine become hers also) & just that fact will save her thousand and thousands of euros over the years in rent (so even if we split she will still likely be able to live with a lot of savings she wouldn’t have otherwise). And while I don’t expect her (in my case) to pay for all the bills in exchange of being mortgage-free, I would still always expect bills and expenses to be split fairly if we live together so it would mean her working (be it part-time or full-time.)
So yes, in some ways it’s unfair that likely she will get to see me not go to work much while she does, on the other hand I do feel I have earned the right not to work full-time and that I am saving her years of financial worries and money in rent and she is technically benefiting from all the years I did work full-time by being financially set up in a way I absolutely wasn’t when I was her age, and in a way that puts us way ahead of most people financially in our age range.
So yes, I fully understand why going to work while your husband chills can be annoying, I also think he is technically providing you with a massive amount of financial safety and savings (in interest) by paying off the mortgage. And if you were happy paying 1000 a month it really shouldn’t matter how he affords his half (because by paying off the mortgage he is likely paying upfront years worth of monthly contributions.)
I would more look into whether or not you could both work part-time once the mortgage is paid off so he never have to go back to full-time work and you can also drop hours.
I would expect him to look after the kids and take on most of the house chores if he does stay home though. Him taking a year off from work doesn’t mean taking a year off of household responsibilities.