At what age can a child sit safely in the front seat of car Texas?

In Texas, children under the age of 13 must ride in the back seat of a vehicle, unless certain exceptions apply (like if there's no back seat or the back seats are occupied by children under the age of 4 who are in car seats). There's no specific age at which a child can *safely* sit in the front seat; the law focuses on age and the presence of a back seat.