Yeah it's true, and it's common across the Middle East, Africa, and Indian subcontinent too afaik. At least in India, usually adult men wearing surma usually means they are Muslim. But I have worn surma as a young Hindu boy too. All kids wear it up to a certain age, and girls and ladies always wear it.

Also yeah the henna dyed hair is wild, usually old people do that when their hair starts turning white. It feels like my Indian grandparents are going through a punk phase when they show up with orange hair and beards sometimes