You must be 18 to buy bb and paintball gun accessories.
12
There is no liscencing for paintball guns in the US.
yes. you can ship a paintball gun anywhere.
Paintball is not illegal in Japan. You can play at the related link.
Only if you own the property or have the owners permission.
kinda
The legal age is 10.
No, 11 is the minimum age to play, and paintball guns are not lethal.
yes I've been to an paintball field in clark county
The legal age is 10 everywhere in the US.
Depends on the field, each field is different, there is no "legal" age you have to be to play paintball but largely fields will not allow anyone under 10 to play. That aside I have played with a few kids younger, you just have to call around to fields and ask.
No paintball markers are not firearms.