This is an interesting Topic................Over here in Australia or at least here in Brisbane you have to be 18 to by a can of spraypaint, this is to stop the teenagers from inhaling and getting high on fumes and also an attemp to minimise the amount of graffiti thats all to common these days, But i think that model paints and glues are available to all ages.........
as far as gun laws go they are very strick, after 30 odd people were gunned down in Port Arthur all semi automatic rifles and shotguns were banned totally, even pump actions are banned.....To own a single shot bolt or lever action you must be licensed and prove ownership of an approved gun safe...Pistols are even more srtict, you have to be a member of a gun club (which you have to attend at least once a month), have an approved gun safe and the weapon is only to be transported in a portable lockable case to and from your gun club, You have to apply for a gun license at any police station where they check all your background information...the whole process usually takes about 3 months............
Needless to say that IMHO a pshyco with a scoped up hunting rifle can do just as much damage as a pshyco shooting an assault rifle from the hip..........