18 for handguns as well, in Texas, and most states.
However, a handgun carried in a vehicle in Texas must be concealed.
(a-1)A person commits an offense if the person intentionally, knowingly, or recklessly carries on or about his or her person a handgun in a motor vehicle that is owned by the person or under the person's control at any time in which:
(1)the handgun is in plain view; or
(2)the person is:
(A)engaged in criminal activity, other than a Class C misdemeanor that is a violation of a law or ordinance regulating traffic;
(B)prohibited by law from possessing a firearm; or
(C)a member of a criminal street gang, as defined by Section 71.01.