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Phil Mickelson was victorious at Sunday's 2021 PGA Championship, becoming the oldest golfer to win a major. Mickelson, who turns 51 next month, won by two shots, leaving Louis Oosthuizen and Brooks Kopeka tied for second. The previous record for oldest major winner was held by Julius Boros, who won the 1968 PGA Championship when he was 48 years, 4 months, and 18 days old. Mickelson has now won six major championships, with Sunday's victory his first since 2013.