Each avatar will have a profile of its own. To edit your Avatar's profile, click the drop down button on the upper right corner of the profile page. On the list, click the small pencil icon right beside the avatar you wish to update. It will land you on a page where you can edit your Avatar's information, including the avatar name, intro text, location, gender, avatar picture. From here, you can also set to display/not display your gender and/or age on the avatar's profile page.