The adjective timeworn is good for describing something that's been said or done so often that it's not interesting or fresh any more. A movie with a timeworn plot has few surprises.
The joke your dad tells every year at Thanksgiving has probably become timeworn, and the meal itself may seem a bit timeworn. A local government's timeworn way of not dealing with problems may finally inspire voters to make a change. Timeworn is a word that first appeared in the 1700's, sometimes spelled with a hyphen: time-worn.