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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.
Fixed
I hit this issue as well. After a couple dozen attempts I managed to pass all the tests anyway.
Afterwards I tried out the reference solution against my own, and the reference certainly has some bug in it. For example, reference::elder_age(3,3,1,100) returns 5 instead of the correct 6 (easily verified by hand).
+1 Had the same issue, verified with brute force algorithm. Just kept submitting until it passed :v