Depends. There are Very different degrees of PTSD. If a person has been adjudicated as mentally incompetent, they cannot. Most vets with PTSD are very mentally competent.
Yes
You need to define"firearms license". There is no license needed to own or to carry a firearm in AZ.
Private citizens aren't permitted to own or possess firearms in Mexico.
They own themselves
I think 18.
As many as you want
?
my aunt has it ptsd is when you are doing something that reminds you of something else you like and you get sad that is what ptsd is
They can't legally own, possess, or have access to firearms, period.
Convicted felons cannot own or possess firearms in any state in the U.S. This includes guns you already own.
Persons convicted of crimes other than minor traffic violations are not permitted to own firearms. They can apply, but will be turned down almost immediately - you may as well not bother.
You will need to find a lawyer who is familiar with firearms law and restoration of firearms ownership.