Hello Bob,
I know governments have their range as that is the only way it can be administerd.
My personal, view having driven 'Classics' since they were current as being older cars with no electronics, which I guess is up to around the mid seventies?. Cars after that gradually did improve but as time passed became less and less distintive. Rember, if you are old enough, to tell what car it was by the sound without seeing it?
The vintage era as coined and as administered by The Vintage Sports Car Club is about 1913 to 1931. Vintage didn't mean old (e.g. a 1928 car would be considered vintage in 1931 by the VSCC) when the VSCC was formed and the rationale was that cars of post 1930, 31 were not as well made or considered as worthy, with the exception of post vintage thoroughbreds, i.e some cars of. the top end makes. The classic 'they don't make them like they used to'.
Alec