Traditionally, serving as caretakers for a property has been a business for couples. In many ways, it makes for an ideal retirement job. Forget about the nightmare of Stephen King's "The Shining." Instead of a snowbound resort, you're more likely to be living rent-free on a country estate, on a private island, or at a beach house in the off season. The work usually isn't overly demanding and gives you plenty of free time. The pay can be decent as well.
Caretaking gives you plenty of time to enjoy each other's company. And clients often look for mature people, so a retired couple may have an inside track.
If one or both of you is a jack-of-all-trades, it's a big help. Caretaking calls for a little building maintenance, some gardening and lawn care, and a lot of common sense problem solving. You might also be called on for pet or livestock care.
Before you agree to a position, you should set down in writing exactly what is and is not expected of you. Without a clear list of duties and responsibilities, there's always a danger of "mission creep," with your employer asking you to do more and more work beyond your initial job description.