They include Coolio and John Stamos, so yes, you are officially old
                                
                                
                                    (Newser) -
                                    You probably felt pretty old when you learned Brad Pitt had turned 50, prompting AARP  to invite him to join their ranks . Well, Merry Christmas, we're about to make you feel even older: The  San Francisco Chronicle  rounds up 14 more celebrities who hit 50 this year. Click through...