Another anecdote.
My nephew is 10 years old and has passed grade 8 at drumming and a really proud Uncle I am.
About a month ago I came home and my wife met me in the drive to tell me that Ryan was in the house with a guitar and he was going to play Wonderwall to me so prepare myself!
Of course I smirked because I know he had only had this acoustic guitar about a week before.
He started to play and I actually had to walk out with tears in my eyes because he was actually playing it.
I walked back in, he asked what was up and I just said it was brilliant but I would show him properly.
What he had done was learn some chords like Em G D A and struck them together to make Wonderwall but of course Noel does play it differently.
A week later he came back and played the verse correctly and then the rest of it correctly which I had never learnt.
He was also playing ACDC Hell Ain't A Bad Place To Be which I taught him very quickly.
I then showed him very slowly Sweet Child Of Mine (which I can't do at full speed) and Back In Black by ACDC.
he came back this week and started playing them at nearly full speed.
I commented that I had never learnt the end phrase of the main lead riff of Sweet Child Of Mine and when he was leaving he shouted "See you Uncle Dave, when I come back next week I'll show you how to play it"

My daughters and wife were wetting themselves.
I'm so proud.
I've talked him into staying on the acoustic for at least another 6 months, maybe until next Christmas so that when he gets onto electric it will be easy peasy.