Major sports organizations — the NBA, PGA Tour and NCAA — are pushing the federal government to require prediction markets to raise their minimum age for sports betting from 18 to 21 years old. The associations have urged federal regulators in recent weeks to tighten the industry's age restrictions given the potential risks to younger bettors, according to letters they submitted to the U.S. Commodity Futures Trading Commission, which is preparing to write the first federal rules for the