how old was donald trump when he graduated high schiil

Donald Trump was about 17 or 18 when he graduated high school in May 1964, depending on the exact graduation date relative to his June 14 birthday. He was born in 1946, and sources note that he graduated in 1964 after attending the New York Military Academy.

He had not yet turned 18 by his birthday that year if he graduated before June 14, but he would have been 18 if the ceremony happened after that date.