Classic Cars inc
Classic car is a term frequently used to describe an older car, but the exact meaning is subject to serious differences in opinion. One school, the broader "antique car club" faction, are very inclusive. Almost any older car in fine condition becomes a classic. The other extreme are the "Concours d'Elegance" supporters, such as the CCCA, who think that only a few thousand "Classic Era Motor Cars" even exist in good condition. They consider nothing newer than 1948 to qualify.
25 years is generally considered a good cut-off age for such terms because it's extremely rare for a vehicle that old to still be owned or used without special consideration for its classic status — by 25 years old, a car will have exceeded its design life by some considerable margin, 10-15 years being the norm barring accidental loss. It will probably need significant maintenance to keep running, and many parts will be hard to obtain through the usual channels. Thus, a non-enthusiast will sensibly conclude that it is not feasible to continue using a car that old for regular driving