well, all i have to say is, a 13 year old girl may be more excited by an ugly daisy guitar than a plain old plywood yamaha. then she would spend all her teen years getting chops, confidence, and let us all hope, taste. plenty of time for martins later.
i waited till i was 24 to get a guitar -- too embarrassed to try when i was young. a big big regret.
i'd buy one for my niece.
an aside: when building my acoustic, the luthier (an old friend) told me he was making it "look like me." by gum, he did -- blonde with hips -- pretty darn girly.
I always thought Martin 000s were sexy as well.