quEstions 19 to 21 ArE BAsED on thE ConvErsAtion you hAvE just hEArD、A、BECAusE thEy hAvE morE Buying powEr. B、BECAusE thEy Enjoy sports morE thAn young pEoplE. C、BECAusE thEy BEComE morE hEAlth ConsCious. D、BECAusE thEy ArE lEss EnErgEtiC thAn young pEoplE.