Shop assistants counted out change because they didn't have tills that worked it out for them. The total price would be rung up on the till but the shop assistant had to work out the change from the amount that they were given. The easiest way to do that was to count it out.
I echo a lot of what others have said.
As a child in the 1960s, all our meals were eaten round the table. No television or radio on
at the same time. We had to ask to leave the table and we were expected to eat everything we were given.
I never saw my grandmothers outside the house without hats and gloves on. I never saw my grandfathers without shirts and ties.
We got properly dressed as soon as we got up and never put on pyjamas until bedtime.
We spent the evenings together in one room because there was no heating upstairs.
We children were expected to entertain ourselves most of the time. We could watch children's programmes like Jackanory and Blue Peter after school, but otherwise we occupied ourselves with imaginative games or activities like playing cards, doing jigsaw puzzles, painting/drawing/crafts, Lego, or reading. In the summer we would outside a lot playing ball games or on bikes and roller skates.
Our parents never told us they loved us. But we were in absolutely no doubt that they did.
Language was more formal, and we definitely addressed neighbours and parents' friends as Mrs X etc, but there was still plenty of laughter and fun.