To dream of classic cars represents your decision making ability or control over situations where quality is an issue. Some area of your life where you feel that you never go out of style or are just as good as you always were.
Consider the make of car and how it makes you feel.
Example: A woman in her 60's dreamed of a well tuned "classic car." In waking life she was quite happy with herself for having maintained her physical appearance so well over the years. She claimed that she was the same weight she was when she was in high-school.