User blog comment:KerryKoopa26/About the revert wars concerning Tycio and Orion001/@comment-14250-20140322215923/@comment-14250-20140402145633

During episode 11's second segment ~20 minute mark (Department Store Tobey) Becky (as WG) refers to herself being 10 years old when talking to Tim about shoes:
 * WELL, I MAY NOT BE A 10-YEAR-OLD GIRL MYSELF, SINCE I'M CLEARLY AN ALIEN SUPERHERO, BUT ON MY HOME PLANET, WE PREFER SHOES LIKE THIS.
 * NOT THAT I KNOW FOR SURE THAT YOU'RE BUYING SHOES FOR A 10-YEAR-OLD GIRL.
 * I MEAN, HOW COULD I, SEEING AS HOW WE'VE NEVER MET.

As this occurs after Becky's Birthday, I now concur that she was 9 prior to 4b, 10 for most of the series, and now 11 in AWOWG.