how old do you have to be to be in the nhl
NHL Entry Draft All players who will be 18 years old on or before September 15 and not older than 20 years old before December 31 of the draft year are eligible for selection for that year's NHL Entry Draft. In addition, non-North American players over the age of 20 are eligible.[10]
Ice hockey Under IIHF rules, each team may carry a maximum of 20 players and two goaltenders on their roster. NHL rules restrict the total number of players per game to 18, plus two goaltenders. In the NHL, the players are usually divided into four lines of three forwards, and into three pairs of defencemen. On occasion, teams may elect to substitute an extra defenceman for a forward. The seventh defenceman may play as a substitute defenceman, spend the game on the bench, or if a team chooses to play four lines then this seventh defenceman may see ice-time on the fourth line as a forward.