Tickets for
Mickey's Not So Scary Halloween Party go on sale on May 1, 2008. Beginning on that date, there will be a link available on the website so that you can purchase them online. You could also purchase them via telephone at 407-W-DISNEY.
People of all ages will be in all manner of dress at the party. Some folks will have full-on Halloween costumes, some will be wearing just face paint, some will have just Halloween-themed T-shirts, and others will have no special dress at all. The choice is really up to you.
I'm sure your teens would have a great time at MNSSHP. Since ticket sales are limited, the lines for the rides are usually shorter. There are trick-or-treating stations (still fun for teens), a great parade and fireworks show, and lots of other surprises. And since sales are limited, if you're sure you want to attend the party, I would encourage you to purchase your tickets early as they do sometimes sell out.
Hope you have a spooktacular time ;-)