Peter Phillips, age 19

While many royals partake in equestrian pursuits, Peter, Princess Anne’s son and Queen Elizabeth II’s oldest grandchild, prefers rugby. Pictured here in 1996, Peter was the captain of the school rugby team during his years at Gordonstoun in Scotland.

Prince Jochaim of Denmark, age 17

Denmark’s Prince Jochaim, the younger brother of Frederik, poses with his father in 1986. Like his brother, Jochaim served in the Danish military.

Henri, Grand Duke of Luxembourg, age 19

On the left, Henri poses next to his mother, Princess Joséphine-Charlotte of Belgium, as the family welcomed Queen Elizabeth II and Prince Philip to Luxembourg in 1976.