How old was Adolf Hitler when he died?

The story behind the answer

Adolf Hitler was 56 when he died. He was born on April 20, 1889, and died by suicide on April 30, 1945—just 10 days after his 56th birthday—in his Berlin bunker as Soviet forces closed in during the final days of World War II in Europe.

His death marked the collapse of Nazi leadership, and Germany surrendered shortly after on May 8, 1945 (V-E Day). To remember his age, note the simple subtraction: 1945 − 1889 =