@NewYorkYankee Fascinating thread!
Me and DH are in our late 50s.
I have also found myself being the one who does the vast majority the housework, for the 33 years me and DH have been living together (Married 32 since 1987.) We both worked full time when we were younger, and I went part time when we had our first child (early 1990s - and the second was born 2 years later.)
Since the day we met, I have done the lion's share of the housework. I feel it was expected of me by society, by my parents and family, by HIS parents and family, and by acquaintances and colleagues.
I did it for the 7 years before we had our first baby, (and was full time at work,) and I did it after the births of our 2 children, (when I was still doing 24 hours a week in my job (3 full days.)
DH and everyone else definitely thought even more that I should be doing it when I went part time. The poor hard working man won't have time will he, working full time? So let the mug of a working mother (working 3 full days) with 2 young kids do it.
I have even had people saying (usually women) 'have you got his dinner on?' (Even when we both worked full time.) That's right up there with 'do you let her drive the car?' (Yep, I have had that said to me a few times. And by a couple of women too, as well as a couple of men!
Even when he DID do a bit of housework if I was feeling a bit under the weather (and he still does this sometimes,) he sees it as 'helping' me.
What makes my blood boil real bad is when I have spent an hour and a half in the kitchen peeling and chopping and boiling and slicing and cooking and standing on my feet, and DH will pop in, grab the knives and forks and put them on the dining table with the table mats and table cloth, and convince himself somehow that he has 'helped me' with dinner. 
Also, if I go out for the day, and leave DH home, I will come back to a sink full of washing up, the kitchen a mess, the bathroom needing a clean, and the hoovering not done, but he will have spent 2 hours re-arranging the tins and packets in the pantry and kitchen cupboards, and stand there smiling proudly at how much he has 'helped me' and how much easier I will be able to find stuff now. 
Thing is, I cannot find a blasted THING for several WEEKS when he does this! 
My mother used to to everything for my dad, and I (and many women I know of my age,) fell into doing it too.
DH is not bone idle per se; he will mow the lawn (although I do most of the general gardening,) he will iron his own clothes, he will maintain/fix the car, he will put up shelves and build furniture, and other various DIY stuff; and if I ask, he will put the washing out,, and run the hoover around. I do have to ASK though. (And as I said, the majority of housework AND childcare has always fallen to me.)