Minecraft wiki entry for Fire, associated text: Fire has an age property that determines how it extinguishes, ranging from age 0 when the fire is set, and growing to age 15.[more information needed] For fire older than age 3, if nothing flammable is adjacent to the fire, or if the block below doesn't have a solid top surface, the fire is extinguished by the next block tick. At age 15, as long as there isn't a flammable block below the fire, a block tick has a 1⁄4 chance to extinguish the fire.