How old was Jordan Spieth when he won his first US Open?

More about Jordan Spieth's US Open win

• Jordan Spieth is from Dallas, Texas.
• He was the youngest US Open winner since Bobby Jones won as an amateur in 1923.
• Jordan Spieth won the Masters and the US Open in the same year; the first to do so since Tiger Woods in 2002
• The course layout at Chambers Bay was unique in 2015 as the 1^st and 18^th holes were both played as par 4s or 5s on different days of the championship.
• After 3 rounds four players were tied for the lead. Spieth’s 69 in the final round got the job done. The other three players tied at the start of the day finished:
  • Dustin Johnson shot 70 for a T2 finish.
  • Branden Grace a 71 for T4.
  • Jason Day a 74 for T9.
• This article at the time by Ewan Murray of The Guardian gives good insight into Jordan’s round and also DJs feelings and Ian Poulter’s strong views on the conditioning of the course.