Legally, only with their permission. Otherwise not until they are 18 years of age.
The legal age of majority is 18.
No.
yes
Yes
Legally in my state, no. However, If state laws are different where you are, and your parents feel you are responsible enough to be left alone without burning the house down, then yes, a fifteen year-old can.
No she can not.
Not legally.
Yes
You can, but only if you are at the emancipation age required by your particular state.
No. Your parents are legally responsible for you.
yes legally. but its up to your parents
So long as you're not legally disqualified from owning a firearm, yes.