If you look after your bulletproof vest it should provide the stated level of protection for about five years. It is vital that you keep your bulletproof vest as clean as possible. For a vest that you wear outside your clothes you can buy a cover. When your vest does get dirty you should clean it as soon as you have a chance. Wearing your vest in hot environments will shorten its life, but there’s not much you can do if, for example, you are working a bodyguard in the Middle East.
Remember, it is advisable to replace your bulletproof vest every five years! Better to be safe than sorry and/or dead.