An recent thread enthusiastically welcomed a new poster with a relatively recent steel-framed bike. Of my two I might consider my 2010 Rivendell a "classic", being a recent exemplar of the type. My '73 Raleigh Competition, on the other hand, is definitely "vintage" and mat even be a classic.

As a group, I'm struck that the idea of classic & vintage is more a mind set than anything else.
Welcome and cheers!
p.s., having a steel frame is NOT a requirement!