Who were Hugh Hefner's ex-wives and whom did he have children with? How old are they now?

Hefner has 4 children: Christie Hefner (born November 8, 1952) and David Hefner (born August 30, 1955) with Mildred Williams, and Marston Hefner (born 9 April 1990) and Cooper Hefner (born 4 September 1991) with Kimberley Conrad.