its impossible to know how many lives have been saved legally, or taken illegally with guns.
In my family we learned about gun safety early on, and by the time i was 7 years old i had a firearm that belonged to me. It was used for hunting.
but i'll just add this for all you fathers out there...
now i dont have a daughter... but i can guarantee you this; she would not only know where the pistol spends its dormant hours, but she would be well versed in its use by the age of 10