Ellen Pompeo doesn't plan on staying on forever. The 50-year-old actress appeared on the latest episode of Dax Shepard's podcast and revealed when it'll be time for her to stop playing Meredith Grey, a role she's held since 2005.«I do not want to be the grapes dying on the vine,» she said. «Already to watch myself age from 33 to 50 now onscreen, that's not so fun.