What job could a teen realistically do nowadays at 16, 17 or 18 and afford a bedsit or to run a home? The minimum wage for that age group is half that of adults and not liveable on whatsoever.
Children used to go out to work at 13 in my grandmas era, she worked in a bakery getting up at 3.30-4am, from age 13 because there wasn't anyone to pay for her to stay in school.
People are acting like it's a personal decision, but what people can afford to do, and what society pays for, has changed- I know someone who left home at 16 and lived in a boarding house, that's not an option for most people these days, you wouldn't even be allowed to take a rental, you need a deposit and references and a parental guarantee.
I've thought for a while my children who are mid-late teens would be fine to run a home and live independently, I wouldn't let them, as there's no need for them to do it, but since about 13 both mine could cook, feed themselves and run their lives if they had to- luckily they don't.
It's also possible to live independently (as in you can live on your own) and get substantial parental help- with money, deposits, support for education and further ed after an initial degree. My mum still buys me a bag of groceries, or pays for things occasionally, I don't 'need' it, it's just a way of expressing closeness and helping each other. I'm middle aged!