No stamina johnboydor, 
I’d have thought that you could have stayed on the heavies until you were genuinely old, when you get a birthday greeting from Her Mag. 
On a serious note, congratulations, keep going while you’re still enjoying it.
I’m sure in such a long and industrious career, there would have been more than a few entertaining anecdotes, that you could add to the Trucks, Tracks and Tall Tails thread.