I have a DB and DS, both over 60, and they are pretty much meat and potatoes (and desserts) type people. Beans are not even accepted very often. We have given up on trying to get them to try things. They will say, O I like green beans (or whatever) I just don't want any, etc. However, they don't get tired of eating the same things over and over. DS could eat a peanut butter sandwich everyday of her life, DB probably could,too. So the rest of the family when we get together cooks what we all like, and let them pick from it. Of course, they get more than their share of the meat and potatoes, but we just live with it.
Since your DH is getting tired of it, I like what C4C did to get her's to branch out.