If age is a factor in Calder voting (talking about Ekblad here), then size should be as well. At 6'4" and 216 lbs he is tied for 23rd tallest defenseman in the league (out of 298 that have played this year), making him taller than 92% of the defensemen in the league, and 64th heaviest, heavier than 79% of the defensemen in the league. So while Ekblad may have been 18 when the season started, he is already a beast physically and larger than 80-90% of his peers.
Personally, I don't think age or size should factor in to the voting (although they certainly do). There are criteria for Calder candidacy, and if you meet the criteria, you should be a consideration.
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