How old is Louis Walsh? 5) He’s the oldest judge on X Factor, he’s currently 64. Mrs O is a year young at 63. Then Simon at 56 and Nicole’s the baby at 38. NEXT: Which category has he mentored the most? Advertisements Advertisements Advertisements About the author: TheNewsDesk Tell us something about yourself. Pages: 1 2 3 4 5 6 7 8