Have you ever wondered how old your Steinway piano is? An antique is classified as something over 100 years old. You can read more about the differences between antique and collectibles in the article differences between antiques, collectibles, and vintage item. Steinway has been in business for around 150 years making only 50 years worth of pianos antiques. To find the age of your Steinway piano please see the Steinway chart below.