Ever walked into a store and frustratingly waited while someone paid in cash?
The elderly thing I get, it was the way, back in yonder times. The poor I don't get, surely your dole money goes into a bank account?
Tbh cash is useful for nicer restaurants and bars once the bill has come you can just leave the cash plus tip and walk out without any hassle or faff.
Less useful in less nice places where they will expect to count it etc.