How old do you have to be to buy a liter in Colorado?

it depends on where you buy it. i don't think there is a legal age. some gas stations will sell it to you if you are under 18. i just bought a Zippo at a oriental store and i asked if you have to be 18 and they said no. but you have to be 18 to buy the fluid for it. i know you can buy bic lighters and such at a king soopers too....