A very old photograph: my hair had not had time to grow yet. And photographs were still black-and-white.

Ute Hahn

My official university homepage is here: PURE database of Aarhus University.
The color photograph there is from 2014. Also a few years ago, now. Hair slightly longer.
Today (2018), my hair is about 30 cm long. This proves that human hair growth accelerates exponentially.