Actors who don't play their true age...
It's obvious that lots of actors do it. In fact, 'lots' should probably be changed to 'all'. Rarely does an actor only accept characters that are exactly his/her age. People play younger and older all the time, be it by a year or two, or twenty. Sometimes this is a big problem.
It's certainly an issue in "Body of Proof". Dana Delaney is 55. Joanna Cassidy is 65. She also looks like she's about 60. So, explain to me who thought it would be a good idea for Cassidy to play Delaney's mother?
Delany (L) & Cassidy (R)