Actor John Lithgow is 67. Singer Patrick Simmons of The Doobie Brothers is 64. Singer-keyboardist Karl Wallinger of World Party is 55. Singer Jennifer Holliday is 52. TV hos t Ty Pennington is 48. Actor Jon Favreau is 46. “South Park” co-creator Trey Parker is 43. Comedian Chris Kattan is 42. Singer Pras Michel of The Fugees is 40. Actor Omar Gooding is 36. Writer-director Jason Reitman is 35.