There’s more evidence of the long-term benefits of high-quality early education, this time from the Abecedarian Project in North Carolina, one of three major longitudinal studies of the impact of early education on low-income children. The low-income children who participated in the Abecedarian Project attended a high-quality, full-time, year-round early education and care program from infancy until kindergarten entry. The children engaged in activities that promoted their language, cognitive and social-emotional development.

At age 30, participants in the Abecedarian program:

• Were four times more likely than members of the control group to have
  
  http://eyeonearlyeducation.org/2012/01/31/benefits-of-early-education-persist-at-age-30/