How old do you have to be to buy a lighter?

The youngest age someone can buy a lighter is 18 years old.

The law varies by state, so make sure to check with your local authorities before purchasing one. In some states, it’s illegal for minors of any age (including 18) to possess a lighter if they’re within sight of an open flame such as a fireplace, furnace, candle or stove. Other locations are more lenient and allow possession without incident so long as the packaging has not been tampered with or altered in any way and there are no matches found on your person when you’re arrested.