I'm bemused by the posters talking about 2 full time working parents being a significant and recent factor causing problems.
I can only assume they came from previously middle-class parents where Mum was a SAHP at least for a while.
2 parents working full time was always the norm for the working class.
The term 'latchkey kid' I.e a DC coming home from school with no parent at home as they were both working so they let themselves in with a key that had was on a string around their neck or left outside the house was evident from the 1940s and popularised in the 70s and 80s.
Often, primary school aged kids.
My Dad was a latchkey kid at primary school in the 60s. Most of his friends were.
Dads were miners and Mums worked in factories or shops.
Kids let themselves into the house, commonly found some bread and jam for a snack then went out to play.
None of them had Mums at home wearing an apron, baking bread and helping with homework like the rose-tinted spectacle idea some MNetters seem to have of universal child rearing.
It was never, or rarely like that for the WC.
And funnily enough, those kids could all read, write, had social skills etc and left school at 15 and got jobs..
In no way is that recommended for child development or child rearing but they got jobs, lived lives, developed relationships etc.
They weren't claiming benefits, unable to work because of ND or MH 'issues' like so many of the young population today.