Video: Gun salutes mark Duke's 92nd birthday Gun salutes were fired around the country in honour of the Duke's birthday, at Edinburgh Castle in Scotland, Cardiff and Hillsborough Castle in Co Down, Northern Ireland. He wrote: "Wishing the Duke of Edinburgh a very happy 92nd birthday as he recovers in hospital today." The King's Troop Royal Horse Artillery fired a 41-gun royal salute at noon to mark Philip's birthday. The Duke was admitted to the London Clinic for the pre-arranged operation on Thursday, following a garden party at the Palace that day. Analysis of the results of the operation are expected to be completed this week, and the Duke is likely to be in hospital for up to two weeks in total while he recovers. Details of the original symptoms behind his admission have not been released, but it is thought the procedure did not involve his heart or bladder, organs the Duke has experienced problems with before.