In an average lifetime, a person breathes in around 45 pounds of dust and debris. More than that, there is more bacteria in a person’s mouth than there are people in the United States and Canada combined. A person can grow up to six feet of nose hair in their lifetime. If a man went his entire life without trimming or shaving his beard, it could reach 30 feet long in his lifetime. The ear is more fragile than most people think. In fact, it only takes seven pounds of force to rip off your ear. By the time a person reaches age sixty, they’ll have lost around 50% of their taste buds, and, in a lifetime, they can produce enough saliva to fill up two swimming pools.