93-year-old media tycoon Rupert Murdoch has tied the knot with 67-year-old retired molecular biologist Elena Zhukova — marking his fifth marriage. The engagement between the couple was announced in March, leading to a ceremony held at Rupert’s estate and vineyard in Moraga, California. The wedding, attended by close friends and family, comes nine months after Murdoch passed on the chairmanship of his media empire to his son Lachlan. Lachlan and his wife Sarah were among the wedding guests, along with News Corp chief executive Robert Thomson and wife Wang Ping, as well as Murdoch’s niece and Th…