Hi Sherry. Welcome to the group. Sounds like your husband already has A LOT of valuable experience. I would imagine he has quite a bit of hours logged, too. Since he has an instructor rating that means he already has a commercial rating too. All this is to his advantage.
I am not an expert - in fact I am "only" a student pilot - but I'm pretty sure his first step would be to go to a flight school to get "refreshed". He may need only one lesson, I don't really know. But of course he'd need to do 3 takeoffs and landings in those types of aircraft to be current again. If that goes well then maybe he can go right ahead and apply for commercial pilot jobs. If while doing the "refresher" he finds he has become a little rusty in his skills, well, he can bring himself back up to par, perhaps working as a flight instructor for a short while...this way he'd be getting paid to fly and build hours. And that could give him leads to other jobs.

By the way, my flight instructor is in his late 50's, maybe 60. My previous instructor was 64.