Since the 2005 collective bargaining agreement between the NBA and it’s players, the Association has required it’s potential players to be either 19 years old, or least one year removed from high school in order to be deemed eligible for the draft. This rule, more commonly known as the one-and-done rule, has sparked controversy since its inception. However it seems that this controversy may have reached its peak, with NBA commissioner Adam Silver advocating for a change in the draft rules, particularly the one-and-done rule.
The specific changes being discussed would either render a prospect eligible for the NBA draft immediately after high school, require a prospect to be two years removed from high school, or some combination of both of these things that allows for players to choose to enter the draft out of high school, but if they go to college they have to stay for two years.