Singer Billy Davis Jr. of the Fifth Dimension is 73. Musician Mick Jones of The Clash is 58. Singer Chris Isaak is 57. Singer Patty Smyth is 56. Writer-director Paul Thomas Anderson is 43. Actor Sean Hayes is 43. Actor Matt Letscher is 43. Actor Chris O’Donnell is 43. Actor N ick Offerman is 43. Drummer Nathan Followill of Kings of Leon is 34. Singer Ryan Tedder of OneRepublic is 34. Actor Jason Schwartzman is 33. Actress Aubrey Plaza is 29. Actress Jennette McCurdy is 21.