I just heard that a new law goes into effect in Texas on September 1, 2017.
From now on, no one under 18 can marry. That includes even if a parent is giving permission.
The only way to marry is to first emancipate which costs a lot of money. Then once emancipated the former child will be considered an adult and can marry.
Basically, anyone under 18 will no longer be able to get married in Texas.
So if you are under 18 and want to marry do so immediate since ending on August 31, 2017 that option goes away under TX law.