user9767: I recently noticed the vintage tag. The tag wiki simply specifies, "Used for old vintage LEGO sets and pieces."
How old is old enough for a set or piece to qualify as "vintage"? For example, would Paradisa and Blacktron be considered vintage? 4.5 volt trains? Classic Space (mid-1980's)? Fabuland? The Yellow Castle? Only stuff from before 1970? Only the very early years?
My personal opinion would be that anything before my "dark age" (circa 1995) feels vintage, but I recognize that many people will have a different perspective. Is there anything approaching a consensus on what is and what is not vintage?
I'm not really asking for an exhaustive or scientific answer, and don't need an adjudication on a borderline case. What I want to avoid is, say, tagging a bunch of monorail questions as vintage and then getting stern messages that vintage means pre-1980 and not just discontinued.

user11100: For me personally, vintage seem to be pre-1995 too (as this is where I got into Dark Age). This was 25 years ago, which is quite some time ago. 
However I could think of a good point of time in LEGO history which could be considered a turning point here - change of Light/Dark Gray [BL] to Light/Dark Bluish Gray [BL] (and few other colors). It wasn't just a color change, but also quite drastical change in set designing approach as well as designers themselves.

user6174: To second Alex's timeframe, the urban dictionary definition for vintage states:

An item of age, usually from around the 1920's to [approximately] 20 years ago. The items could be anything from furniture, children's toys, to clothing and household bits and pieces.

So that'd be anything before 2000 at this point.  I wish Zhaph's answer was closer to the usage I'd heard, but it seems like I'm going to go feel old for a while now.

user56: Looking at the questions we currently have tagged vintage it does seem to imply "early 80s" at the latest - however as with cars and furniture, this is likely to be a moving target: would you consider the pre-realistic skin tone licensed sets as "Vintage LEGO Star Wars" for example, or just "Classic"?

9767: <p>I recently noticed the <a href="https://bricks.stackexchange.com/questions/tagged/vintage" class="post-tag" title="show questions tagged &#39;vintage&#39;" rel="tag">vintage</a> tag. The tag wiki simply specifies, "Used for old vintage LEGO sets and pieces."</p>

<p>How old is old <em>enough</em> for a set or piece to qualify as "vintage"? For example, would Paradisa and Blacktron be considered vintage? 4.5 volt trains? Classic Space (mid-1980's)? Fabuland? The Yellow Castle? Only stuff from before 1970? Only the very early years?</p>

<p>My personal opinion would be that anything before my "dark age" (circa 1995) feels vintage, but I recognize that many people will have a different perspective. Is there anything approaching a consensus on what is and what is not vintage?</p>

<p>I'm not really asking for an exhaustive or scientific answer, and don't need an adjudication on a borderline case. What I want to avoid is, say, tagging a bunch of monorail questions as vintage and then getting stern messages that vintage means pre-1980 and not just discontinued.</p>
 11100: <p>For me personally, <code>vintage</code> seem to be pre-1995 too (as this is where I got into Dark Age). This was 25 years ago, which is quite some time ago. </p>

<p>However I could think of a good point of time in LEGO history which could be considered a turning point here - change of Light/Dark Gray [BL] to Light/Dark Bluish Gray [BL] (and few other colors). It wasn't just a color change, but also quite drastical change in set designing approach as well as designers themselves.</p>
 6174: <p>To second Alex's timeframe, the <a href="https://www.urbandictionary.com/define.php?term=vintage" rel="nofollow noreferrer">urban dictionary definition for vintage</a> states:</p>

<blockquote>
  <p>An item of age, usually from around the 1920's to [approximately] 20 years ago. The items could be anything from furniture, children's toys, to clothing and household bits and pieces.</p>
</blockquote>

<p>So that'd be anything before 2000 at this point.  I wish Zhaph's answer was closer to the usage I'd heard, but it seems like I'm going to go feel old for a while now.</p>
 56: <p>Looking at the questions we currently have tagged <a href="https://bricks.stackexchange.com/questions/tagged/vintage" class="post-tag" title="show questions tagged &#39;vintage&#39;" rel="tag">vintage</a> it does seem to imply "early 80s" at the latest - however as with cars and furniture, this is likely to be a moving target: would you consider the <a href="https://bricks.stackexchange.com/q/287/56">pre-realistic skin tone</a> licensed sets as "Vintage LEGO Star Wars" for example, or just "Classic"?</p>
