My mother was born in 28. I dont think she has ever hid money…she is going to be 90 in April. She is cheap though about buying things.
My wife’s parents were that way. When her Mom died, she spent two days going thru clothes, purses, and shoes. Nearly everything had anywhere from 12c to $20 stashed somewhere. The safe in the basement had $10k, including birthday envelopes for YEARS that her husband gave her, all with money inside.
Every drawer in the house had change. When I cleaned out the place, I just chucked any cash into a coffee can. The very last day, as I was leaving, I yanked a tattered piece of ancient shelf paper out of a hall closet. Out tumbled a $50 bill.
My grandmother died in 1980, and I last found some cash she’d stashed away in 2017; a $10 bill in an envelope amongst some old paperwork relating to the construction of the old family house. Thanks, Grandma!!
When I was about 15, my grandfather took me down to his basement and pointed to a place in the floor where the cement looked fresh and told me he had buried some money under it. When he died a couple years later I told my uncle about it and he took a pickax down there are hacked away till he found an envelope with $1000 in it. Since this was 1954, I would assume that would be more like $10K today. He was born around 1885 but certainly lived through the depression.
I wish* my* grandma could still be stashing money thirty-five years after she was dead. 
After my grandmother died my grandfather found $10K hidden in different places in the house. He immediately spent it frivolously, which was why my grandma hid money from him in the first place. 
One of my widowed great-aunts died back in the mid-80s. She had gotten a bit squirrely in her later years, so my family had to go through each and every thing she had in her apartment before we threw the stuff out. I believe in the end we found about $1,000 in cash, hidden in bits and pieces everywhere.
She and my late great-uncle had owned a general store for many years, and they had been pack rats. By the time we finished cleaning the apartment that night, we had filled 6 dumpsters with their crap.