First: You shouldn't care about what others think.
I can understand why your husband thinks it's too late for him. I am also in my 50's and my daughter has a 6 months old son and I could never do that again. It's not just now but if that newborn is 20 your husband is 71.
The older movies are more atractive because of the flaws, you see the pencil strokes changing between frames. Today IMO they are too flawless.