Wings, chips, etc. are available at Diversions and Promenade lounge in the evenings. They are usually put out about 6 pm. The "Beat Street" area (night club area) is reserved for adult guests (defined as 18 and over) after 9 pm. During the day and early evening, there are activities in these areas that are open to families. Promenade lounge is a family area all day and night.
SO...teens can get the munchies up to 9 pm. There is no charge.