Back in the late 80's, we had such age traveling films as "Big," in which Tom Hanks is a little boy who gets an adult body and father/son swaps like "Vice Versa," itself a spin on the mother/daughter reversal of 1976's "Freaky Friday," so the time seems ripe to resurrect the genre with "17 Again," a kind of merging of these films with "A Wonderful Life."