Logan's data of Birth: September 14, 1989 (27 years old) Carlos' data of Birth: August 15, 1989 (27 years old) James' data of Birth: July 16, 1990 (26 years old) Kendall's data of Birth: November 2, 1990 (26 years old)
Carlos' the oldest, followed da Logan, then James, and Kendall is the youngest.