Twins and Hair loss

Two types of twins

There are two types of twins: identical twins and fraternal twins. There are two types of twins. In identical twins, the DNA is the same. In fraternal twins, the DNA is different just like any other siblings. 

Identical twins' hair may look different with age

The hair of identical twins look similar at young ages and may look different when older. Genetic hair loss has a lot do to genetics, but not everything. Smoking, ultraviolet radiation, medical conditions (ie. thyroid disease), obesity, and stress all affect the process of genetic hair loss.