Whether it was continuing to be a part of U.S. Ryder Cup and Presidents Cup teams, finding a new workout routine, changing coaches, discovering a healthier diet, befriending - and needling - tour players who are young enough to be his son, Mickelson did his best to stay young.
"It has been a treat this week", Casey said.
Mickelson is on the verge of winning for the 44th time in his career, and matching Mark O'Meara with five victories at a tournament he first played in 1995. "I hit some good golf shots and didn't get anything out of it today", Casey said.
Mickelson sits at -18 for the tournament, with three holes to play.
He also won the Pro-Am with Don Colleran, the chief sales officer for FedEx.
"And so it's gratifying to see the results and to finish it off the way I did". Sometimes I just get in my own little bubble and I don't see the big picture and I just wanted to finish. Dustin Johnson won the first of his two titles in 2009 when the final round was delayed until Monday because of rain, and then canceled because the storm system wouldn't leave. Mickelson poured it on, showing his skills have not deteriorated a bit at age 48, controlling spin beautifully to back pin positions.
He matched the low score of the final round while playing in the last group, turning a three-shot deficit into a three-shot victory.
"A phenomenal round of golf", Casey said. During Saturday's round Day found 10 of 14 fairways and 14 of 18 greens in regulation but missed several short birdie putts to post an even-par 72 and a nine under total. He played the final 26 holes in cold, damp and windy weather without a bogey.
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Mickelson needs to win the US Open to complete the Major Grand Slam and with Father Time accelerating along, playing this year at a venue that he knows so well and that he plays so well, offers him a chance.
He will return to Pebble Beach in June for the US Open, where he made his pro debut in 1992.
Pebble Beach was so soft that balls were plugging in the fairway when they landed.
His first one also was a Monday finish, when players returned in August - more than six months later - to finish the third round of the weather-plagued tournament to make it official.
Mickelson lives for the moment.
However, he does not anticipate his latest win at Pebble Beach being of much use due to how different the conditions will be.
This article was written by Doug Ferguson from The Associated Press and was legally licensed through the NewsCred publisher network.