Across Europe, it is a point reached somewhere between the ages of 16 and 21, marking the moment at which care from children's services comes to an end.
Many are in need of ongoing support and treatment, but among those moving into adult care many report feeling abandoned, neglected or poorly looked after.
Others fail to get any support at all from adult services - their care reaching a very real cliff edge.
[For more on this story by Helena Tuomainen, go to https://www.bbc.com/news/health-45411901]
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