18-year-old players can actually play in the AHL. As long as their birthday is on or before September 15 of each season and they’re 18 or over, they are technically eligible for the American Hockey League, what prevents prospects from making the jump early is a NHL/CHL agreement that states all 18 and 19-year-old players not retained by their NHL squad must be returned to the CHL club that holds their rights. It’s a rule that dates back to 1979 as a way to keep the junior product entertaining which in turn helps put people in seats. It’s why European players and college kids can make the jump right away. It’s also where the “nine game rule” stems from, being an underage player can have nine games in the NHL before their entry-level contract kicks in for the season.
So yes assume they older.