Not many would think of Brad Pitt as a card-carrying member of AARP, but the actor turns 50 today, which makes him eligible to join—and the organization isn't exactly letting him forget it. It put out a mock cover of its magazine featuring a picture of Pitt, People reports, along with the message: "Acclaimed Actor, Producer, Humanitarian, and Family Man, Mr. Pitt Joins the Club." See it here. More senior celebrity birthdays today: Keith Richards is 70 and Steven Spielberg is 67. (More Brad Pitt stories.)