I believe there is some variation from country to country. In Australia, a veteran car is pre 1918. A vintage car is pre 1948 and a classic car is 1948-1960. This is for road cars and is somewhat arbitrary. CAMS sets the age limits for historic racing cars.
If you wish I could publish the cut-offs for all the Historic racing classes in Australia. In answer to your original question, thoroughbred racing and sports cars bulit no later than the mid'80s, with a genuine competition history are eligible for historic racing. Production Sports Cars are eligible for historic racing if they were built before 1975. Production Touring Cars are eligible for historic racing if they were built before 1973.
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