Child Stars turning 18 is a big deal?

I hadn't really thought about it until I read this article about Daniel Radcliffe, aka Hawwy Pawtah, who turns 18 later this month and is dismissive of accounts that he's about to go wild and crazy. JP doesn't really know how kids go wild these days, but I figure he's going to celebrate his newly-realized ability to legally contract and sign a whole bunch of deals?