how old is luke in a new hope

Luke Skywalker is 19 years old in Star Wars: Episode IV – A New Hope. This age is derived from the official Star Wars timeline, which places his birth at the end of Episode III: Revenge of the Sith (19 BBY) and the events of A New Hope at 0 BBY/ABY, making him 19 years old during the film. His twin sister Leia is also 19 at this time, as they were born minutes apart