Jan. 21: Opera singer Placido Domingo is 77. Singer Mac Davis is 76. Actress Jill Eikenberry is 71. Guitarist Jim Ibbotson (The Nitty Gritty Dirt Band) is 71. Singer-songwriter Billy Ocean is 68. Actor Robby Benson is 62. Actress Geena Davis is 62. Actress Charlotte Ross (”NYPD Blue”) is 50.