EITC for Childless Workers Act of 2014 - Amends the Internal Revenue Code, with respect to the earned income tax credit, to: (1) reduce from 25 to 21 the age at which a taxpayer first becomes eligible for such credit, and (2) increase the amount of such credit for taxpayers with no qualifying children. Directs the Secretary of the Treasury pay to U.S. possessions (including the Commonwealths of Puerto Rico and the Northern Mariana Islands) that do not have a mirror code tax system with the United States amounts of the earned income credit which such possessions would have received if a mirror code tax system had been in effect.