No, too many made
So where exactly does quantity come into the equation?
When does quantity not come into a classic equation?
Car needs to be rare / not common for it to be considered a classic, or its not a classic is it?
Too many Omegas are around, they are a bland, forgettable saloon saloon to most.
Never does or has.
As a rule of thumb its a car that is 25+ years old.
An antique car is 45+ years.
So no, totaly wrong, numbers have bugger all to do with it 
Disagree, numbers have
everything to do with it.
They
only reason they become classics at 25 years, is because they are rare. Been destroyed over the years from rust, accidents and replacement models.
If every single Jag E Type was still on the road that were built, would they be considered classics?
Put it this way... Great Western's HST Fleet is 25 years old, are they considered Classic? No, they are common as muck on that line. steam train from the same era though, which no longer runs main line commuter services, is considered 'classic'