In the US, you must be 18 years old to legally purchase a long arm and not have any disqualifying issues.
Depends on where you are.
No
for a rifle it is thought to be a .50 calibre but a gun company made there own for there own sniper rifle the .408 calibre
You will have to define the term "Sniper rifle". It could mean anything. The only TRUE sniper rifle is a rifle issued to a sniper. They are simply rifles that are capable of long range accurate shooting. The rifles used by US military snipers during the Vietnam was were simply civilian hunting rifles with decent telescopes.
Only if you have the relevant BRITISH license. =]
The old woman in "The Sniper" by Liam O'Flaherty is killed by the sniper after she reveals his location to the enemy. This leads to a tragic ending as the sniper recognizes that he has killed his own brother.
18 years.
18
in the U.S 1 minute old!
18.
no if he has a permit
Rifle and Shotgun only.