I would tell my husband if I were in your shoes, that you feel you are too old to deal with all that keeping a dog entails.
However, if he wants one, or two, that is okay, as long as he does all the feeding, exercising, hoovering, trips to the vet, etc.
Tell him kindly, how long you have found these tasks take, and that you have no intention of living in a mess of dog hairs, so can you sit down and work out a compromise?
If he will not consider a smaller breed of dog, then will he consider confining the dogs to having their beds in some easily cleaned place, like a utility room and only allowing them into one other room of the house.
German shepherds are quite content being outside most of the time, so a well-fenced garden, which I presume you already have, or a large dog run should meet the case.
I do realise that if you have always done all or even just most of the cleaning that he has absolutely no idea how long it takes, but he can surely learn.