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Phil Mickelson will turn 51 years old just one day before the U.S. Open later this summer. He had last won a major championship in 2013 with his career-best run coming in the mid-aughts. And yet, on the longest course ever at a major under blistering heat and with winds swirling, he made history as the oldest major championship winner by capturing the 103rd PGA Championship at 50 years, 11 months, seven days old. 

For Mickelson, it's the sixth major championship and 45th PGA Tour win of his career. He has won the PGA Championship before, in 2005, and that 16-year gap between wins ranks among the most impressive in the history of the sport. 

The previous record for oldest major winner was held by Julius Boros, who at 48 years, four months and 18 days old won the PGA Championship in 1968. The second and third-oldest major champions, Tom Morris Sr. and Jack Nicklaus, were both 46 years old.

Mickelson's mark puts the final stamp on a certified Hall of Fame career and sets up for a fascinating summer as he chases the career grand slam at the U.S. Open. He received a special exemption for the U.S. Open just one week ago but has now stunningly made it on the merits of his game after an eight-year drought between majors and more than two-year gap between PGA Tour wins was closed.

Here is a look at the top 10 oldest major winners, according to PGATour.com. 

Oldest golf major championship winners

GolferTournamentAge

Phil Mickelson

2021 PGA Championship

50 years, 11 months, 7 days

Julius Boros

1968 PGA Championship

48 years, 4 months, 18 days

Tom Morris Sr.

1867 The Open Championship

46 years, 3 months, 10 days

Jack Nicklaus

1986 Masters Tournament

46 years, 2 months, 23 days

Jerry Barber

1961 PGA Championship

45 years, 3 months, 6 days

Hale Irwin

1990 U.S. Open Championship

45 years, 14 days

Lee Trevino

1984 PGA Championship

44 years, 8 months, 18 days

Robert De Vincenzo

1967 The Open Championship

44 years, 3 months, 1 day

Harry Vardon

1914 The Open Championship

44 years, 1 month, 10 days

Raymond Floyd

1986 U.S. Open Championship

43 years, 9 months, 11 days

Ted Ray

1920 U.S. Open Championship

43 years, 4 months, 16 days

Rick Gehman is joined by Kyle Porter and Greg DuChamre to break down and react to Phil Mickelson's victory at the 2021 PGA Championship. Follow & listen to The First Cut on Apple Podcasts and Spotify.