We could always say that they have to be eligible for the Calder Trophy to be considered a prospect.
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Eligibility: To be eligible for the Calder Memorial Trophy, a player cannot have played more than 25 games in any single preceding season nor in six or more games in each of any two preceding seasons in any major professional league. Beginning in 1990-91, a player must not have attained his 26th birthday by Sept. 15 of the season in which he is eligible.
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