Actor-director Kevin Costner is 55. Country singer Mark Collie is 54. Actress Jane Horrocks (Absolutely Fabulous) is 46. Comedian Dave Attell (Insomniac) is 45. Actor Jesse L. Martin is 41. Rapper DJ Quik is 40. Singer Jonathan Davis of Korn is 39. Singer Christian Burns of BBMak is 37. Actor Jason Segal (How I Met [...]