The lack of support pre-2000 for care leavers was abysmal. I was told to leave my FC's ON my 16th birthday. I found out I was pg with my DD two weeks later while sleeping on a park bench
I will tell you my experience of the support for care leavers, in doing so I am not doubting your experience in any way but my experience is so different I have to say that first so you dont think im doubting what you say!
My mother was a foster carer for nearly 20 years, mainly fostering teens. Most of them left between the age of 17-18, a couple at 16 and one a while after turning 18.
For several months prior to leaving care the teens would have some days, overnights and weekend stays at 'the flat' this was a self contained 'training' flat that had 24 hr support workers there in the background [in another self contained part], they were taught to plan, budget and cook meals, clean, wash clothes and tidy the flat.
My mum also [as she did with her non fostered children] taught them to plan, budget, keep finances in check/sort out bills, cleaning/housework was something everyone was involved in.
When my mum, support workers at the flat, SWs and the teen all agreed that they were ready they would move into their own flat, some would do that by first living in a shared accomadation, but all the teens that left care from our house went straight into their own flat.
Care leavers have priority for local authority housing, most were nominated to housing associations [which had nicer properties and better tenant support TBH] ALL care leavers are eligable for a Community Care Grant so they were able to furnish/carpet their home.
Once they had moved into their own place there were support/mentoring schemes, my mum was mentor to several care leavers over the years, some that had left at age 18, the scheme was to be up to age 21, but several stayed in touch for years after that.
This was in 1980s-90s