Isn't it puberty for Islam countries. Not a certain age.
Discussion
Depends on the country.
For Iran, here's quotes from the civil code:
"Note 1 - the age of majority for boys is fifteen lunar years and for girls nine lunar years."
"The marriage of a girl
who has not married previously is dependent on the permission of her father or her
paternal grandfather even if she has reached the full age of majority"
