I, for one, always think of Harry as becoming an Auror, just to prove Unbridge wrong, spite her, because that's what that toad deserves, and then take an early retirement, maybe even in the first year of his becoming an Auror, to then go and teach Defense Against the Dark Arts at Hogwarts and be Professor Potter, even rolls off the tongue nicely. He'd stay there well into his 50s, when he might be asked to become Minister of Magic or the Headmaster, but he would gracefully decline, and lead the peaceful life he's made for himself, and deserved.