When Ford introduced the car in 1964, it was cheered as a "car for young America." After all, the leading edge of the baby boom was just turning 18. How much brand love is there for Mustang despite being on track to sell fewer than 80,000 this year? There are 5.5 million Facebook followers for Mustang. That's what comes from 50 uninterrupted years of selling more than nine million copies of the same marque.