it takes some pretty good muscles to be able to hold on and do that... I suspect this guy is no where close to retirement age.
That said... last year I was on the north shore of Oahu and watched a guy well past retirement age plop a board into the water and hitch up to a kit and take off like he was simply driving to work... put all my whining about long hikes that day right to shame.
I slinked back to the car, turned on the AC and issued the order to head for the hotel bar... sigh.