Actually, how tall were all the boys when they were 12-13 years old?

Admin Mawile: (●ゝ∀･)ﾉ These are really just approximations, but I tried to take their canon heights into consideration, as well as who might have had a late growth spurt. 

Shuu: 5′4

Reiji: 5′6

Ayato: 5′3

Kanato: 5′1

Laito: 5′3

Subaru: 5′4

Ruki: 5′3

Kou: 5′2

Yuuma: 5′8

Azusa: 5′3

Carla: 5′9

Shin: 5′4