"You think I would have learned my lesson. It is my seventh year and I probably should have backed off a few per cent going out into the wind, which would have allowed me to use that tailwind a bit more."
A dramatic finale in the race for third saw Christchurch's Dylan McNeice recover a near two-minute deficit with only 4km remaining to overhaul Australian Alex Reithmeier and secure an all-Kiwi podium in 8:38:04.
It was a sensational triumph for Brown who nearly quit ironman two years ago after a dark period in which he became disillusioned with the demands of the sport only to once again rediscover his old magic last year.
"My first victory in 2001 was pretty cool, but when you win when you are nearly 43 it is right up there. I never thought I'd be winning this race at 42. I still love the sport. It is a tough sport and we are all in a world of pain at the moment."
Brown admitted he was concerned after he trailed the leaders by more than five minutes after the swim but had closed the gap on Bozzone by the second transition.
"I felt strong throughout the bike and managed to slowly catch up," Brown said. "The wind was getting pretty strong and I rode pretty solidly. I felt bloody good coming into town with the wind behind me and managed to catch Terenzo in the last 10km. I think I needed to as he would have felt much better with a lead going into the run."
In the women's race, Kessler led from gun to tape, stopping the clock in record time 9:05:45 to draw level on overall victories in the women's elite event with New Zealand's Erin Baker and one clear of Australian Jan Wanklyn.
Gina Crawford, the 2009 champion, claimed a third successive runner-up spot but was 20m25s adrift after struggling with a mechanical issue with her bike. Former international rower and cyclist Melanie Burke was third in 9:41:50.
"With the conditions I certainly didn't expect the record," Kessler said. "The bike was so hard because of the wind and even the run on the back half of each loop the wind was brutal. I was elated to break the record. I worked out the math and for that last kilometre I sprinted as fast as I could to try to snag it."