It just occurred to me what a great side gig my mother has had most of her life - elementary school teaching.
When we were growing up my mother didn't work until we are all in school, then she started occasional substitute teaching at public schools in our city. This gave her bread-and-butter money to buy things my Dad, the ultimate tightwad, would never spring for. She liked kindergarten so a lot of times she would just sub a half-day, leaving plenty of time to look after four crazy kids and house. Very flexible.
Once we are all in junior high or so, she started teaching regular full-time at her favorite elementary school. Teaching is a great gig any as it is low stress, low hours, summers off, and in our city the benefits were fabulous. I remember her insurance paid for our eyeglasses, dental, etc. Elementary school started more than an hour later than high school, so she could still get us all off in the morning and leave last. She got home about 4 pm which was still time for a grocery run and dinner on the table by 5:30.
She continued teaching until they forced her out at about 65! By that time my Dad was 71 and had been retired from his 30-year government job since he was 55. He told her they needed to travel more so she finally hung it up. This travel has gotten progressively more up-scale as she has attempted to spend some of her considerable savings and income.
Now, she is 77 and she still substitute teaches at the same school! She lets them know when she is in town and available, and they bring her in most days. Gets her out of the house and provides a nice totally un-needed income which she tries to spend on travel but can't possibly. My parents have a paid for house, drive vehicles until they die, etc, frugal as ever. I'd guess their current income is 100% of his last salary (which paid for mortgage and four hungry kids), inflation-adjusted, plus amazing medical and full armed services access including standby air travel around the US. The old man is happy to fly all day in the back of a C140 in a jump-seat to visit his sister and play some golf.
Totally dialed-in.