Vintage defined?  

Definitions
Gustaf; I can tell you how American general antique dealers define those terms, (I can't speak for any other countries, occupations, etc.)
The term "antique" used as an adjective generally means something is 100 years old or more.
The term "vintage" used as an adjective means something is in that gray area between 99 and 35 or so years old. But just because you see something described as vintage doesn't mean it's not a copy. It can be an old reproduction or copy and still be "vintage". People use the term vintage in a generic way just to let potential customers know that the item is not brand new or "newer" or "contemporary".

depends
"Vintage" is also used for relatively new things when they are old to their collectors. By that, I mean that 20-year-olds think that 1980 clothing styles are vintage. To me, age 53, a 1980 t-shirt is what I use to dust the furniture.

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Its scary,when I hear Miley Cyrus had a "1980s" style birthday party...like the 80s were MANY years ago.Its best to get a date:1982 A.D. or 250 B.C.

Vintage Electric Mixers
I use the term 'Vintage' in my blog: http://vintage-electric-mixer.blogspot.com/ and I think it is a fair adjective. The items I describe are sort of mid-20c, junk to some and noteworthy to others. They are not in production, though the Kenwood is still evolving. They are certainly not antiques.

Thanks
Riki, yes, a grey area. That was what I was thinking too. And no, you are right that it doesn't imply original work although "vintage fake" somehow sounds strange.
spanky, that certainly puts things into perspective, haha. But yes, as you note it is a subjective notion that varies between types of goods.
azurechicken, well I was born in the 1970s so I instantly think 1980s A.D. I am more alarmed when I meet people that look and act like perfectly normal grown ups yet were born in the 1990s. The 1990s! That just seems a bit too recent.
yoDesign, I understand but where do you draw the line? At or around 35 years as Riki does? Blog looks very promising btw.
So we can conclude that there is a) no definition, and b) different interpretations of vintage even in the context of furniture.

I think Riki is right on :...
I think Riki is right on : 100 years or more equals antiques and 35+ is vintage (until is becomes an antique).
Guitars become vintage at 30-35 years. I can see clothing being vintage as early as 20 years. They have a much shorter life span in general. Furniture and other design objects last much longer.