Jessica Tandy
Norman Taurog with his film Skippy, at the age of 32 in 1931.
i believe it was Marlee Martin in the Children of a Lesser God movie she was 21 and it was 1987.
Sidney Poitier, who won for his performance in "Lilies of the Field" (1963).
No. Tom Hanks won Academy Awards for his work in the films Philadelphia and Forest Gump.