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    • Not enough tests either: needs edge cases with equal ages. And for those, you have to tell what is the expected ordering.
    • the description is incorrect: first + last name -> nope, there is a space in between => give rather a complete example.

    Note: sounds very much like a duplicate, too... :o

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    No random tests. It should be stated in the description that the result array should be sorted from the oldest to the youngest.