His Wikipedia page says he was born on Dec 15, 1989. https://en.wikipedia.org/wiki/Ben_Blankenship
Bring Back the Mile says he was born in Dec 19, 1989. http://bringbackthemile.com/athletes/detail/benjamin_blankenship
His IAAF profile says he was born in Dec 15, 1988. https://www.iaaf.org/athletes/united-states/ben-blankenship-253920
Team USA page says he was born on Dec 15, 1988. https://www.teamusa.org/usa-track-and-field/athletes/Ben-Blankenship
Olympic page says he was born on Dec 15, 1988. https://www.olympic.org/ben-blankenship
Runner's World article dated April 26, 2013, says that he is 23, which would indicated a 1989 birthdate and would only be 28 years old now. https://www.runnersworld.com/elite-runners/no-fear-of-the-unknown
So Ben, how old are you?