i am not sure, he is rather immature....
I prefer "youthful". Especially in comparison with an educatoress or so who shall remain nameless.
Oh, and by the way, Your Snideness, I just received the following encomium from the enchanting, discriminating Miss January 24th over at Ye Olde Poetree Branch, and I quote: "Oh Arghie! You are a delight!"
You may paste that one in your scrapbook for future reference. Then put another copy in your smoke and pipe it. You're welcome!