FILE - At left, in a Jan. 30, 2019, file photo, New England Patriots' Rob Gronkowski speaks with members of the media during a news conference in Atlanta. At center, in an Aug. 24, 2019, file photo, Indianapolis Colts quarterback Andrew Luck speaks during a news conference following the team's NFL preseason football game against the Chicago Bears, in Indianapolis. At right, in an Aug. 2, 2019, file photo, Carolina Panthers' Luke Kuechly watches teammates warm up at training camp in Charlotte, N.C. Life in the NFL is short. The recent retirements of three of the game's best 30-and-under stars -- Gronkowski, Luck and Kuechly -- could be coincidence or the start of a worrisome trend. (AP Photo/File)
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