Veteran Corporal Samwel Nthigai Mburia - who claims to have been born in 1906 and may be the oldest man in the world - served in Palestine and the Far East.
The King and Queen are on a state visit to Kenya, which has been overshadowed by growing calls for the monarch to apologise for wrongdoing in Britain s imperial past.
During a solo engagement, Charles sampled popular local food at Nairobi Street Kitchen, ordering a saag paneer kathi roll wrap and butter chicken samosa.