Foster care and prisonWatch
Dunno tbh! Problems, lack of prospects, criminal record most likely, no education usually have few or no or poor gcse's, and used to "surviving" on the bare minimum or through ill means. Homelessness. Dunno just going by ppl I know, the reality, and that I was in care for a short time and saw how it went.
Girls too but most find a hostel and then work or claim child tax unfair how contrived it all is for women.
Here is where you can look for links.
The Prison Reform Trust Report - In Care, Out of Trouble.
The Howard League for Penal Reform Trust.
The Care Leavers Association.
Gov. UK will have the figures for fostered and looked after children who ended up in prison and the reasons why.
Look at ‘Staying Put’ which puts measures in place for fostered children to remain with their foster parents after they turn 18, so long as the foster family agrees.
I hope this gives you a start.