Holy shiznat! My twelve year, blue haired son grew an inch and an eighth in less than 30 days and, AND!! HE OUT GREW ME! He is hereby grounded to his room until he is eighteen where he is not allowed to grow until such time that he can handle all that height.
This is the door frame behind the kitchen door where we have been keeping track of growth spurts (or sometimes lack thereof) for the last several years.