Wikipedia is written by anyone and everyone, it's public access and is therefore not what I would call "gospel".
Retro = Retrospective
ie. from 'days gone by' - possibly subject to the individual's own sense of retrospection I would think, and so would therefore include any era up to about 10 years ago.
Repro = Reproduction
Something that has purposely been made to replicate or give a nod to a style from the past. tethersend I think what you say about furniture, exclusively pre war, used to be the case but I think that has changed now. When my mum was an antique dealer in the 80s that was the only instance where I heard the term reproduction used in this way but now the term is used to describe many things that now replicate items from the second half of the 20th century - I'm guessing this has changed, partly, because we are now in a new century and also because it is now more fashionable to hark back to post war styles.
The Oxford Dictionary definition of the word vintage, under these circumstances is, "denoting something of the past of high quality, especially something representing the best of it's kind." ..... so in other words, not some old tat from when Primark first opened!
Someone on Freecycle listed a 90s television as 'vintage' a while back. Hmmmm, no dear, that's just an old telly. Last week another person listed a vintage 1980s "Space Helmet" design TV. Not strictly vintage, but I would say retro and a design classic (if you like that sort of thing) so not as annoying as the first listing.
I'm not sure if there is an official line on how old exactly is vintage. I know something has to be 50 years old to officially be classed as an antique but not sure if is the same rule for vintage. It seems to be the case, in fashion terms that anything that was fashionable when the baby boomers and the next generation, known as Generation X, were growing is considered vintage. Not much has changed, the scope has just got wider with the new generation as more time/fashion has passed. When we were teenagers in the 80s we would wear old 50s & 60s pieces, now the teenagers of today are inspired by the fashions their parents and grandparents wore. They didn't used to use the word vintage like we do now, or charge for it like they do now - more's the pity, but it's the same principle.
It does seriously get on my tits though that people list any old crap on ebay as vintage. It wastes so much time sifting through it all when you're looking for an actual vintage garment.