*without peeking at the links after #1*
Exclude #13 for being underage. Of the remaining 19 (i.e.: the adults) the 10 youngest get picked.
So ... #4, #12, #14, #2, #3, #9, #15, #16 with two of #1, #5, #10, #17, #18 selected randomly by die roll (#5, #10).
Sorry, Miss Norma Jean the RNG did...