Another possibility I had not considered. Actually I know a couple of folk who should, given their talents and abilities, be mentoring. But to a certain extent that is what we do for godchildren. I have books to give mine, and I attend to some aspects of their learning, if only at a distance. Books may always be given, and to the reading child interested in knowing more (two out of the five), a book can work wonders. I gave Jostein Gaardner's 'Sophie's World' to one, which sparked an interest in philosophy of a simple kind in a twelve year old. We all do what we can. My own mentors were my teachers, and a parent of a schoolchum: Robin Buss. Robin died last year. I didn't keep in touch enough, dammit. I still honour the man. He encouraged me in my poetry and writing.
That is, I suppose, the thing I would be best at: encouraging folk in their writing.