CAVEAT: What is accepted as an 'antique' *does* vary. widely. *Depending* on the type of product involved.
For furniture, the 'accepted standard' is "100 years or more" old .
For automobiles, 50 years does qualify for legal status as an antique in most states.
For computers, 50 years would be (nearly) universally regarded as 'antique'. Probably even 25 years.