A rug about 100 years old or older, the point at which an old rug is called antique rather than vintage or semi-antique. Age is a price factor of its own, since a 200-year-old rug costs more than an otherwise equal 100-year-old one, and it works alongside artistry, rarity (for example the output of a workshop that no longer exists) and condition. Very old rugs have often been repaired at some point, which shows most clearly from the back, so condition calls for close inspection.
An age class for rugs that are no longer new but not yet antique, in trade usage typically no older than about 60 to 70 years, though dealers' cut-offs vary, some counting from about 50 years or stretching the class toward 100 years, and the looser label vintage, applied to rugs of roughly 20 to 90 years, overlaps it. They are priced on the same factors as new rugs (material, design, colors, weaver skill, straightness) plus condition: repairs, color run and how evenly the pile has worn. Because material and labor costs rise every year, a comparable semi-antique rug usually costs less than a new one.