Are we talking really young, as in children, or just anyone under fifty? In the supermarkets is been mainly 20/30s not wearing masks, or socially distancing. Our next door neighbours, late 20s, helpful and polite. Paid staff in the charity shop 40+ great, volunteers aged from late teens upwards, pretty helpful.
My grandchildren are young and we don't see the oldest ones often, only twice since lockdown, the youngest a bit more often. They're pretty well mannered and know how to behave in public. How they'll turn out? Who knows, but I enjoy any time I have with them for now.
What I remember of my granny was her kindliness. She was frail, and confined to bed for many years. She didn't complain, but always had time for her 'bairns'.