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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.
The test is fine.
If the expected age depended on a specific year, it'd most likely be 2019, when the kata was created. The same issue has already been reported and fixed - show me proof that it's not working for you, or I'm closing the issue.
Because Rajesh is the correct result (in every language). Show me why you think it should be Penny instead.
The tests are fine. Not a kata issue.
The tests are fine, if you want to use recursion that's up to you, and it is possible.