It contains a number of genera now dissociated in several different families, especially Myida, So. lenida, Saxicavid/r, and GastrocKanidx. Close A Dictionary of Science (1843)
exists and is an alternate of . Vintage is considered to be items that are at least 20 years old. At this point, anything from the 80s and 70s would be considered to be vintage. It is antique when it is at least 50 years old, so at this point (2012) anything from 1962 and later.
In general, cohorts range from 10 to 20-plus years. The other way to think about it is in terms of historical epochs. How long is a period of history dominated by one so-called generation of people. Depending on the author or discipline, this can range from 50 to 80 years. When I think about generational epochs, I rely on the Gettysburg Address!