The word-"EXPIRY"

In my life I have found so many people who are so much conscious about the expiries...One will go to medical shop and first he will check expiry date...Almost all the direction of business is covered by such things. But I am so disturbed by this word “EXPIRY”. Why and from where this word has came.And one more thing we humans are also alive with the expiry dates. Value has expiry too. An old calander without any new future is no longer valuable so we all are covered with a boundary. But do we know our expiry date. When we will be useless?This issue is really requires attention. Because we don’t know how to react and respect. We all are selfish creatures on this land. Can you imagine what will happen if you will know the expiry date of yours?Nothing is static on this life and not completely dynamic, one cycle has been set by god and we all are follower wise or otherwise. So we should respect our values and so other’s too. Do one thing have a look on the wall and you will find numbers of things which are there for long time but you did not notice about the thing, but ya in the past the thing was your basic need for sure but not its expired...But one day will come when you will be expired and god will not care to look at you for once because life is a milestone of circle and we will lose the game if we will not walk with the time...That’s it...