I'm not even retired yet, and I'm already discovering that there areal kinds of part-time jobs out there.
A person just has to find one they want, or that fits their needs, availability, pay, etc.
There's:
-- regular part-time (where you have to be there year round, set days, they set your schedule)
-- remote/WFH
-- part-time seasonal
-- part-time temporary
-- starting one's own business
-- temp agency assignments
-- or.... gig economy, and a subcategory of that is instant pay, or paid same-day
I just found out about a new one of those -- sudshare -- doing laundry for people who don't want to do their own. You sign up, and start getting orders (if there are any clients in your area). You have to pick the laundry up and delivery back NEXT DAY. 24 hour turn-around is a must. you get paid .75 a pound -- for pick up, wash, dry, fold, and return. Some orders have special instructions like which detergent to use, air dry, etc.
I don't know I that would work for me..gas spent on pick up/delivery, increased water bill, wear and tear on my washer, etc..
But it's a gig. Supposedly stay-at-home moms and students are picking up the work.
As an old fogie, I just marvel that there's an app for any activity that a person is willing to pay someone else to do. Who knew? I'm stuck back in the old days of Grub Hub and Instacart.