That depends on your local laws - call a gun dealer and ask - they'll be happy to discuss the issue with you.
NICS takes a couple of minutes.
Yes. As long as your charge was a misdemeanor and not a felony. You may have a delay in your ability to actually take the gun home if the background checkers decide so. But eventually you should get the gun.
You have to be 18 to buy a long gun and 21 to buy a hand gun.
For a long gun you have to be 18. For a handgun you have to be 18.
18 for a long gun, 21 for a handgun.
18.
18 for long gun, 21 for hand gun
Legally, you can't own a gun until you are 18 (long gun) or 21 (hand gun).
Federal law says you must be 18 to buy a long gun
Some period of time
If you tried to buy a gun and it came back as a "delay" that doesn't have anything to do with the State of Kentucky. Background checks are processed through the federal system, and what a delay usually means is that there is something on your record that they cannot verify, or there is someone with a similar name to yours and they are trying to verify your identity.
Depends on the law where YOU are. Varies place to palce.