In terms of the child's well-being, when is the best time to adopt them?

Is it better for a kid to be raised in one family for most of their life, or is it better for a kid who has been bounced around the foster care system for a while to find a family? If the latter, what age is the best for them to find a permanent family?

In terms of the child's well-being, when is the best time to adopt them?
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