when was this?
1918
George VI
In February 1918 he was appointed Officer in Charge of Boys at the Royal Naval Air Service's training establishment at Cranwell. 
how old was the last king of england when he died 57 who is george vi? He was King of the United Kingdom. was he part of the military? Yes, he was appointed Officer in Charge of Boys at the Royal Naval Air Service's training establishment at Cranwell.
wiki:11591761
George VI [SEP] Military career and education
With the establishment of the Royal Air Force Albert transferred from the Royal Navy to the Royal Air Force. He served as Officer Commanding Number 4 Squadron of the Boys' Wing at Cranwell until August 1918, before reporting to the RAF's Cadet School at St Leonards-on-Sea. He completed a fortnight's training and took command of a squadron on the Cadet Wing. He was the first member of the British royal family to be certified as a fully qualified pilot.