(名詞) 零點五世代：美國 65 歲以上的外來移民。
這名詞係創造來與被稱為 1.5 generation (1.5 世代) 的較年輕移民有所區別。
Sociologists call Mr. Singh and his cohort the “.5 generation,” distinct from the “1.5 generation”—younger transplants who became bicultural through school and work. Immigrant elders leave a familiar home, some without electricity or running water, for a multigenerational home in communities like Fremont that demographers call ethnoburbs.
—Patricia Leigh Brown, " Invisible Immigrants, Old and Left With ‘Nobody to Talk To’," New York Times, August 31, 2009