Board Thread:News and Announcements/@comment-4224349-20140926000846/@comment-4400895-20140928062223

Steven's voice actor (Zach Callison) probably did hit puberty by the time the audio for this episode was recorded. But,as of right now he's 16.

Or maybe it's Steven himself seeing as his official age is 12,and that's usually the age where boys start "becoming a man".