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In this Thursday, Jan. 4, 2018 file photo, youths play ice hockey on a frozen pond at Philadelphia's Franklin Delano Roosevelt Park during a winter storm. New concussion guidance shows there isn’t enough solid evidence to answer some of parents’ most burning questions about contact sports. That includes what age is safest to start playing them. (Matt Slocum/AP, file)

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New guidance on concussions shows there isn't enough solid evidence to answer some of parents' most burning questions about contact sports. That includes what age is safest to start playing them.

By LINDSEY TANNER, AP Medical Writer November 11, 2019