The 2-3 fans engaging #19 were probably your age (25-30). Whatever they were yelling caused him to stop and identify them in the crowd and yell back at them. These fans were even yelling at the Virginia right above them in the stands - but of course the Virginia fans were approx their same age.
No blue hairs involved (unlike the USU game two years ago). So you can drop the assumption that all east stand fans are blue hairs.