My 74 year old uncle is the same. He collects a 6 figure pension, he doesn't need the money but he does need a place to go to be around people and being a door greeter at a Home Depot (pre-covid, anyway) was what he wanted to do.
Yep, my grandfather has a pension from working as an electrician his whole life, and now he works in the hardware section. He's getting too old and frail to do the activities he used to do, so working in the hardware section lets him feel useful instead of sitting around the house doing nothing.
The strategy of asking the oldest employee for advice has worked well for me at Home Depot.
Not sure if that's better or worse. It almost reminds me of the old ladies in Japan who get arrested on purpose, so that they go to prison and have company.
I've occasionally talked to Uber/Lyft drivers who've said the same thing.