For insurance and registration purposes, the age of a classic car, in most cases, is at least 20 years old but not more than 40 years old. If you are going to register it (and insure it) as a classic, it should have been kept to its original design and specifications.
Is a 25 year old car a classic UK?
The age of classic cars can vary considerably, and there are several definitions regarding how old a car must be before it becomes a classic. HMRC defines classics as being over 15 years old with a list price of at least ꌕ,000, but to be tax exempt, the classic must be at least 40 years old.