Duluth’s only casino opened its games to younger customers this week. Fond-du-Luth Casino dropped its minimum age for gambling from 21 to 18. “The primary reason for the change of policy is to be consistent with our sister property, Black Bear Casino, where the minimum age has always been 18,” said Maurice Ojibway, Fond-du-Luth’s general manager. Both Black Bear and Fond-du-Luth are run by the Fond du Lac Band of Lake Superior Chippewa. Ojibway noted that most casinos in the state welcome gamblers as young as 18. The Minnesota State Lottery sells tickets to people 18 and older, as well….