Bobby Jones was 21 years old when he won his first U.S. Open in 1923. He was born on March 17, 1902, and took that title at Inwood Country Club in New York in 1923.

Quick correction

The question seems to mean U.S. Open , not “American Open.” Jones’s first U.S. Open victory came at age 21.

Tiny timeline

  • Born: March 17, 1902
  • First U.S. Open win: 1923
  • Age then: 21

If you want, I can also give you his age at his first U.S. Amateur or his first major win.