Why does hair darken with age? It’s so darken your clothes common to have blonde curls as a baby or a toddler, and as you get older, your natural hair colour is now a far darker brown or black. It also becomes coarser with age.
It’s all down to the fact that there are several different chemicals in our body that are responsible for our hair colour. People usually have a mix of these pigments in their hair, although usually one is the dominant one. Black eumelanin and pheomelanin are usually expressed fully from birth, which explains babies born with black or red hair. Babies born with blonde hair have little, if any black eumelanin. Blonde babies could however have brown eumelanin. People with genes that code predominantly for brown eumelanin are the ones whose hair is most likely to darken with age.