Question: How old you have to be to buy a gun in texas?
Disambiguated questions and answers: question: How old do you have to be to buy a gun in texas from a private citizen?
How old do you have to be to buy a gun in texas from an FFL dealer?
answer: 18 years of age or older
18
21
21 years or older
Natural Questions answer: 21 (from the Wikipedia article "Gun laws in Texas")