While checking out my favorite shops on Etsy.com I ran across a jacket from the 90's labeled as Vintage. I didn't think this was correct, so I decided to look into this further. I went online and found a great source. Apartment Therapy.com had an article on this very subject. Well, I learned that an item can be classified as vintage if it is over 20 years old. The article also defines the differences between, vintage, retro, and antique. Having said that, I love vintage clothing and retro furniture!
You can check out my source at: http://www.apartmenttherapy.com/age-defining-an-130615.