Traveling Buddies

We will be traveling with 3 high school groups. Two groups come from the same high school in Sycamore, Illinois (one group has 17 and the other 14). There's also a small group from Maryville, Missouri with only five people. I asked about the age range and was told this (including our group):
2 (13-year-olds)
3 (14-year-olds)
4 (15-year-olds)
6 (16-year-olds)
10 (17-year-olds)
5 (18-year-olds)
17 (adults)