Dominican third baseman Juan Carlos Arias has failed his age investigation, according to a major league source.

Major League Baseball has declared Arias, who has presented himself as a 16-year-old born Sept. 16, 1995, ineligible to sign for one year. He will be eligible to sign on June 12, 2013, which means he will still be eligible to sign during the 2012-13 international signing period window. Arias did pass the league's investigation into his identity, although Baseball America could not verify whether the league made a determination on what it believes is Arias' true age.

Arias, who is from San Pedro de Macoris and trains with Alfredo Arias, is 6-foot-3, 220 pounds and stood out for his strength and raw power, though scouts have said he's had trouble getting to his power in games and will have to put in work to stay at third base.