x2While I am a strong gun right advocate and shot my first shot gun when I was six but was not allowed and did not have access to the guns until I took a gun/hunter safety course at age thirteen. So no a five year doesn't need a gun at age five per se.. Sure give it as a gift but with "when you are old enough you can use with my supervision" and after a gun safety course speech. A five year old just doesn't have the mental capacity to fully understand what damage a gun can do.
I think the question that bears asking is "why was the gun not secured with children of that age in the house?" You know they require a license for just about everything, drive a car, buy a gun,catch a fish even get married but why don't the have a license to have children and a course you must pass? Truly amazes me that people have offspring with no clue how to care for them.