We have a couple of guys still flying at 70+. They love the experienced guys that won't be around all that long to make the bigger money that is possible as you move up in longevity. The biggest obstacle for him may be currency if he has been retired for a while. As much as they love hiring older guys, they won't touch them if they haven't been flying something recently- it probably wouldn't matter if it was only a 172, but they have to be fairly current in some sort of airplane.