Juha, 29, wears a hair system and would never believe it. Juha Seppänen's hair began to thin at the age of 18. Eventually, he started using hair systems, and you would never tell. Juha Seppänen's hair began to thin at the age of 18. Now he wears a hair system every day, which is shown in the picture on the left. “Hi! I'm Juha, and a year ago I started using hair systems”.