‘Expendables’ stars share secrets to extending their glory.
USA TODAY - 8/16/12 Wednesday's premiere of Expendables 2 brought the action-star thunder as Sylvester Stallone, Chuck Norris and Arnold Schwarzenegger walked the black carpet. Despite some years, they looked so fine that USA TODAY just had to ask: What's your secret? Chuck Norris, 72: "I work out on the…