Blake Griffin is retiring … man, time goes by! We're not all as spry as the day Griffin joined the league in 2009 and became a phenom thanks to his superb athleticism and penchant for posterizing opponents.The six-time All-Star's jumping ability reeled in millions of new NBA fans hoping to catch more high-flying dunks by Griffin. But Griffin's finally at the point, and age (35), to retire officially, announcing his plans for retirement after thi…