My old man... 4yrs old or something... Clutchless 2-speed Yamaha Zinger... I figured out how to take the throttle stop screw out real quick. Then a few years later, learned the magic of the clutch on an XR 75 with my old man screaming at me the whole time
... so wheelies were fun... whatever.
I will say that I've learned more about riding street on the old TWF though... Brought me in from squidville and pointed me towards excellent reference material and more competent riders.