I've seen some spectacularly rude older people , with a great sense of entitlement and on the other hand some delightful,polite youngsters.Tbh some people have no manners whatever generation they are.
Having said that my jaw dropped the other day whilst I was parked waiting for DH to sort something in the post office.A 30 something man roared up in a flashy car ,completely mounted the pavement outside the PO ,parking fully across it.Leapt out and went into a nearby shop.No concerns for pedestrians, mum's with buggies ,mobility scooter users.Selfish in the extreme,and there was a car park with spaces next door.
I was hunting for a post it to stick on his windscreen but he reappeared and did a furious Uturn and sped off.
DH came out and said there had been a very rude elderly woman in the PO,however,queue barging and talking to the staff like dirt !