My parents are. They had already done a good job investing for retirement but reached multimillion when my mom inherited a large part of her parent's farm, which was worth 8 million dollars. She was so happy when she told me that one day I would inherit part of it and that I would be a millionaire. I didn't let her know that I will already have a million before I get any from her!
There’s a joke about an older couple at a Mercedes dealership, eyeing a loaded S-Class with the salesman on their heels offering to answers any questions. The wife tells the salesman they’re concerned because they want to leave the bulk of their wealth to the kids and the salesman says “If you don't buy it I guarantee your kids will be driving one as soon as you’re gone.”
This joke is funnier to young people because many older wealthy types would actually rather leave the bulk of their assets to their kids than spend it.
It’s amazing how much better giving is in comparison to spending for many people. Your mom sounds like one of them. She loves you.
This is my parents. I'm fairly confident they meet the criteria in the OP, yet if I go shopping with mom she will hem and haw about buying a sweater that's 60% off and will cost her <$20 and that she clearly really likes. Frequently, she will say she won't buy it unless I find something in the store she can buy for me as well. (I have a number of solid tees in many colors, since they have a decent basics like at her favorite store, and often nothing else there appeals to me. I grab one because I want her to have that sweater, not because I need a tee.)
I'm grateful that mom and dad have started allowing themselves more travel in the last 5ish years, because they clearly enjoy it. Their travel is fairly moderately priced (and uses a timeshare thingy that they've gotten a TON of value out of, contrary to the usual experience), but it's not crazy cheap. It pleases me that they are going on 2 trips a year, far more than it would please me to inherit a few thousand dollars more for each year they do this.
Same with massages. There's a massage school near my mom where she can get a massage for about $40. She really enjoys it, but can't bring herself to spend the money to do it as more than a special occasion thing. I wish she'd spring for the $80mo it would cost her to get her 80-yo body massaged every other week. But no luck convincing her. Yet when I have a visit planned, "Do you want me to make massage appointments for us" is one of her first questions.