At the present, rugs considered “antique” are pieces produced up to about the 1940.
Rugs made between the 1940's time and the late 1960’s are “semi-antique rugs”
Rugs that were made from around the 1940's through the late 1970’s are considered vintage rugs / mid century modern rugs
Rugs that were made in the past 20 to 40 years are usually refereed to as "used rugs" or just “old rugs”.