I am sixteen next birthday am I to old for dress up partys? ?

Lol no!

I am having a horror party for my 16th bday in two months. I am being a zombie .-.

Never! Do something cool! Like favorite superhero, or famous personalities is always fun. I think I might have an actual costume party. Like massive animals, stuff you would rent from a party store.

Of course not! Just start going as something more adult and sophisticated than what you would have worn as a small child. Dress up parties are for all ages.

Adults have costume parties :

http://en.wikipedia.org/wiki/Costume_party

The really big parties are huge commercial events, called Cosplay (means Costume Play) :

Cosplay in Western Culture

http://en.wikipedia.org/wiki/Cosplay#Cosplay_in_We...

Cosplay:

http://en.wikipedia.org/wiki/Cosplay

I don't think so ,except it would be more like a costume party

My brother's wedding party was a dress up party! So no, you aren't! :)