Bewitched S03 E27 The Crone of Cawdor

"Witches are people too!"

Darrin is warned by Sam not to kiss a beautiful client named Terry Warbell. There is a good reason: she is a magic crone who steals the youth of poeple that she kisses. Of course, Darrin doesn't believe Samantha, but he sees for himself when Terry turns into the old hag.