"He’s an orphan himself. Group homes and all." Harry really doesn’t want to get into Marvolo’s age, especially as complicated as it is by horcruxes. He’s seen some of Marvolo’s memories from both before and after the second horcrux and he can tell how different they are, the two periods, where one has emotion attached to it and the other’s dissociative. "He doesn’t want magical children growing up like that."