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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Check out line 2. You may accidently put a tab instead of space. My identation for line 3 is space while line 2 is tab.
Still .. I guess you should edit your description, in the description, it says that the arrays/list is "partyAges" not "party_ages".
I'm not native speaker of English. So I don't understand what is this kata trying to do.
Any example please?