Might not be such a bad thing. Your retired, everything paid off, not many monthly bills... Sort of depends on your, health, lifestyle, and where you live. You'd have to be willing to put in some hours, but you might do alright. Some places will always produce a few coins, maybe a little jewelry, they get replenished by the regular visitors. There is always scrap metals, save them, and cash them in. People lose things all the time, and wish they had a metal detector to find them. I've lost a few small parts in the lawn, when working on the car, that I would have found, rather than having to buy, or find a suitable replacement.
Doubtful you'll get rich, but could make a decent difference between just keeping up with you basic expenses, and actually getting out a living. Besides, it keeps you active, gives you a sense of adventure, something to look forward to.