What is John Catesby Harington Age? John Catesby Harington came to this world on 7 January 1984 in London, United Kingdom. His current age is 40 years old at the time of this writing of this short bio about him. He is the glorious son of David Richard Harington (father) and Deborah Janes Catesby (mother). His zodiac sign is Capricorn. John also has a famous brother in his family who goes by Kit Harington, famed for known for his roles in The Games of Thrones and Eternals. John Catesby Harington great-grandparents were the inventors of flushing toilets. Source: https://legendsbio.com/biography/john-catesby-harington