Source: National Geographic Magazine
China is on the brink of a huge demographic shift. Over the next two decades, an unprecedented baby boom from the 1960s will age into “the largest number of elderly ever in the history of China,” says Yu Xie, a Princeton University sociologist who studies the country.
Why is elderly, adjective, not followed by a noun.
Is it a kind of ellipsis? Because the omitted word is assumed to be “people”.