Just spoke to J about it - he asked an older friend to show him some basic guitar chords, and then bought the music books to his favourite albums and played along with the music. He says he thinks it's best to play with others, but you have to be able to play a bit first.
What sort of music is he into? I think if he can pay his fave stuff it will really help. He was about 15 when he started and says he didn't get good till about 20, and that was playing an hour or so most nights for the five years. To be fair, his 'good' is most people's excellent, so don't expect it to take that long!
He also said, starting younger is better, as long as they don't get bored and give up...
Sounds like a few lessons to start him off would be good, during which he can borrow a guitar and then if he is confident he can continue, get some music and a guitar. Maybe give him the money for his birthday but say he can't spend it until he has given lessons and stuff a go for a decent while?
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