Mostly healthy for Daniel Radcliffe at least. He did develop an alcohol dependency during the later Harry Potter movies that he worked to overcome.

For a lot of celebrities I can only really guess at how well adjusted they are. Sometimes they seem normal until they have some sort of psychotic break and all of the skeletons in their closet come out, and sometimes they just put on a brave face while masking years of abuse and trauma.

At least as far as impressions, there are a few other names I can think of. Zendaya is a former Disney channel kid who seems to be doing well for herself. The Sprouse twins (Suite Life of Zack and Cody) also seem like they developed into normal adults and now just don't spend much time in the spotlight. Kenan Thompson also has a good career as the longest serving cast member on Saturday Night Live, and he started as a child actor for Nickelodeon.

But I have no idea how much of that comes down to luck or just having better support from family (or again maybe just burying some skeletons/trauma). A lot of other child actors who worked alongside the names listed above ended up messed up in one way or another.

I was also thinking about Haley Joel Osment.