The first time I started, I quit a week afterwards (I was 12 and impatient ). I went back to it when I was fifteen, and picked it up pretty quickly (a few months). I'd definitely recommend it!

The most difficult thing to begin with is getting your hands used to the width/feel of the neck. But give it a go, and not necessarily with guitar lessons (I've never bothered with lessons, but there are some really good websites for learning).