ToolBox -

You cannot disable the “Enter your Age”question in the registration page due to USA COPPA regulations that prohibit Children under 13 from joining sites.

You can however hide their age so no one sees it on the site.

Add to your CSS file:

 

li#ka_profileAgeItem {display:none !important}  /* hide age on Profile Page */

 

/* hide age on hover over username in Forums */

li.ka_moreInfo div.ka_popSide div.ka_sideQuoteBoxBody ul li.ka_userAge {display: none !important;}