Mom --age 88--is a huge tipper. Sometimes 50% (despite my scoldings!). I'm talking $50 on a $100 meal. When she walks in, it's like she owns the place.
Actually what I hate is that she's so popular with the waitresses, bartenders, managers and owners that when I eat with her you can't take two bites without someone coming up to talk with her.
She loves it but for me it's like trying to have a quiet meal with a celebrity and having autograph seekers bugging you. It's her entertainment for the day.
Now she has me doing it: When I'm out with mom, she leaves a nice tip and then I quietly hand her favorite bartender another $20 in cash, just in case it's a shared tip place.
(Robbie, I hope you're proud of mom and me)
Note that mom was never a cook and we grew up eating out; usually 5 nights a week and most breakfasts too. But she does make great....reservations.