I do think parents are (probably with a degree of reason) a lot more protective now than they were a few decades ago.
But I do remember being shocked in the very early 90s that a schoolfriend of a dd was not allowed, at 12 or 13, to go shopping in town without a parent.
I was probably too much the other way! When they were no more than 13, dd2 and a schoolfriend announced that they wanted to take a day trip to Calais, on their own! They wanted an adventure, and to practise their French.
My initial reaction, ditto of the other mother, was a firm NO! - but after an awful lot of agonising, we gave in. The trip involved a train from outer SW London, into the centre, across London, train to Dover, and foot passenger tickets to Calais.
And this was well before everyone had mobile phones.
You can imagine our exhortations of Stay Together! Keep your money and passport safe! etc., and all parents having kittens until they were safely back.
But there was no trouble, and they thoroughly enjoyed their ‘adventure’.
I’d never have allowed it now! Calais is a very different proposition from what it was then.