YouGov measured consumer perception of Apple using its BrandIndex Buzz score, which asks U.S. adults whether they've heard anything about the brand, and if they have, whether it was positive or negative.

Scores can range from 100 to -100, and are the result of subtracting negative feedback from positive, meaning that a score of zero is equal parts positive and negative.

Before July 2011, scores for the 18-to-34 age group led that of 35 and older. But by November 2011, the older group's score had shot to a record 48, while the younger group's number was 13 points lower at 35.

As of today, the 35+ group's score was 31, or 15% higher then the 18-to-34 age group's score of 27.

"Apple's scores are still very positive," said Ted Marzilli, the global managing director for BrandIndex, in an interview. "It's not passe among younger consumers, but scores for that age group have been declining."