Maybe it's just one round, but Thursday at The Open, 50-somethings Lee Westwood and Phil Mickelson shot under par.

So it came as a bit of a jolt for American audiences who woke up Thursday morning to see Lee Westwood near the top of the leaderboard at the British Open. (Also up there: Phil Mickelson, who outdueled Westwood in 2010 at the Masters. Fifteen years ago.)

Phil Mickelson and Lee Westwood are offering reminders that the British Open doesn't discriminate against older players.