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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.
If the idea is to make sure we check for invalid input, you could be a lot more evil and include fixed texts for 02/30/YEAR, 09/31/YEAR, or even 02/29/2001 if you're feeling particularly devilish. Most solutions I have seen so far would have failed those.
Right now the test cases are in an odd in-between zone: they are enough to annoy the warriors slightly and stop us from finishing the kata on autopilot, but they do not truly put our answers to the test.
Nice kata. The test cases are not good enough though. My solution produced the output 1806 (expected 1807) for input age("10/09/2104","10/09/3911"), but I could still push it through in the next submission. Also, it would be good to mention what needs to be done about leap years.