Well, I just read the Harry Potter series (thoughts, questions, SPOILERS aplenty)

[Askia]

@Fretful Porpentine

Peter is described as balding, going grey, and generally looking older than your average thirty-fiveish wizard.

Your Rita Skeeter example provides your answer. Jason Alexander was only 35 when Seinfeld was on the air in 1996. I thought he was in his early 40s.