Another story that I read as a child has popped into my head, and I can’t seem to find it. I seem to recall that it was a short story in a collection of stories about child geniuses, or some such (fiction, not true stories).
The story is about a little girl (Melissa? Melinda?) who never ages; the story is basically a doctor or someone in a position of authority (the “kindly” sort) who she tells her story to, of how she became immortal (and ageless), and how she has lived, being put in foster homes, eventually escaping, trying to avoid notice and being “taken care of” by adults who are a great deal (centuries?) younger than her.
I would like to reread the whole book, if I can find it, and would love it if someone remembers what I’m talking about.