Who is the guy in the middle when it comes to the age of the members of One Direction?

Explanation

One Direction's band members birthdays: Liam Payne was born 29th August 1993, Louis Tomlinson was born 24th December 1991, Harry Styles was born 1st February 1994, Zayn Malik was born 12th January 1993 and Niall Horan was born 13th September 1993. Louis is the oldest and Harry is the youngest.