In general, a car is considered a classic when it is at least 20 to 25 years old. Some definitions may set the age limit at 30 years or even older. The age criterion is often combined with other factors such as historical significance, rarity, design, and condition.
For instance, the Antique Automobile Club of America (AACA) defines a classic car as a vehicle that is 20 to 44 years old. The Classic Car Club of America (CCCA) has a more specific definition and considers cars manufactured between 1915 and 1948 as classics.
Ultimately, the determination of what constitutes a classic car can be subjective and may vary among car enthusiasts, collectors, and organizations. However, the age of a car is often a key factor in defining its classic status.