Youthquake? Statistical Evidence Showing The PGA Tour Plays A Young(er) Man's Game

Strokes gained creator and stat guru Mark Brodie has crunched numbers as far back as possible and concluded that, at least based on Strokes Gained, the elite player of 1996 to 2004 was a lot older than today's top players.

Writing for Golf.com:

From 1987 until 1996, the average age of the top 100 players in total strokes gained steadily rose from 32.3 years to 36.5 years. In that decade-long stretch, Watson and contemporaries like Greg Norman, Tom Kite and Hale Irwin were playing competitively into their late forties. The average age of the top 100 players remained steady between '96 and '04.

Since '04, Broadie finds that the average age of the top 100 strokes gained players "plummeted from 36.5 to 33.0 years."