[quote name='Morrigan' post='1591929' date='Nov 17 2008, 13.39']Roughly two years, maybe less, have passed in AFFC since the beginning of AGoT.[/quote]
I'm going to have to disagree with this. Unless GRRM has explicitly stated that only two years have passed, the books suggested to me at least 3 years. There are a few things that argue otherwise of course, but the evidence as a whole suggests at least a few years have passed, and certainly not fewer than 2.
Robb certainly wasn't growing a beard at 15, as unlikely as it would be even at 16 or 17.