Gmail was in a very limited public beta during 2004 and 2005, not moving out of beta status until mid 2009. Even if he was an early adopter (which seems unlikel

Gmail was in a very limited public beta during 2004 and 2005, not moving out of beta status until mid 2009. Even if he was an early adopter (which seems unlikely given the length of his email address and the fact that the oldest reference to it Google turns up appears to be from 2011), we still don't arrive at 15 years. Whether he has 13 years or 13 months worth of email stored in his Gmail account, I hope he has started archiving it now!