(CNN) -- Veteran Tom Lehman takes a one-shot lead going into the final round of the Transitions Championship in Florida on Sunday.
Lehman acknowledges the gallery after a successful birdie putt at Copperhead.
Lehman turned 50 two weeks ago and is eligible for the Seniors Tour, but showed age is no impediment with a third round 68 at the Copperhead course in Palm Harbor for an eight-under-par aggregate.
Former U.S. Open champion Retief Goosen is Lehman's nearest challenger after joint halfway leaders Nick Watney and Steve Stricker fell off the pace.
Reigning U.S. Masters champion Trevor Immelman, who defends his only major title in just three weeks' time, had his second successive 70 to be five under and joint third with Jonathan Byrd, Australian Stuart Appleby and Charles Howell.
Lehman, the United States captain in the crushing Ryder Cup defeat to Europe at The K Club in Ireland three years ago, is the first player of 50 or older to lead a PGA Tour event with a round to go since Greg Norman at last July's British Open.
"I really enjoyed myself today," he told Press Association.
"The front nine was a comedy of errors and on the back nine things got going.
"I didn't touch a club at the end of last year because of my injury and started the year poorly, but quite frankly I saw good golf coming."
Lehmann missed five months at the end of last season with an elbow problem and is bidding to become the seventh oldest man to win a PGA Tour event.
Stricker had a 73 with four birdies and six bogeys to fall back to seventh and Watney, winner of the Buick Invitational last month and runner-up to Phil Mickelson in last week's WGC-CA Championship, a 74 that put him only three under and joint 15th.