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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.
Ok, I mark the issue as resolved.
Why do you think it is a bug? you expect to get "Peter is 26 years, 9 months and 23 days old" but your solution returns "Peter is 09 years, 27 months and 1990 00:00:00 days old".
Can you check your code again