117 years ago with 1900, which seems a "sensible" default date for computing. It's likely that the birthdate was left blank.
Does AW allow it to be left blank? The answer that sprung to my mind was to take 100 off the age - younger family members have done this on Facebook to gain access before the age limit (13 IIRC).
so you're thinking its disguised code for a 17-year old? though that seems unlikely as the profile was created in November 2013