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