Almost one in three Americans in their mid-20's now fall into this group, up from one in five in the late 1960's, when the Census Bureau began keeping such data.

20岁左右的美国人几乎有三分之一成为这个群体中的一员，高于20世纪60年代的五分之一，那时人口调查局开始保存这一数据。