I gave our son an iPad for his 6th birthday, mostly because he likes to watch Sonic and Mario videos on YouTube. He didn't have any training as such, he already knew how to reach YouTube and type in 'Sonic' from using my wife's laptop.
And apparently, using it every day and thousands and thousands of trial and error, he has become astonishingly adept at it. He can do stuff we never thought possible like change the font, connect to a different network, download applications, reconfigure email, and the whole enchilada. No training. He can't even read that much. Now he's extrapolated and started showing my wife how to do stuff on her iPhone and she's stunned because she didn't know various options and what-not were available.
I think it has to do with being very young and experimenting over and over. Are people having similar experiences?