Like many other argricultural products,a coffee bean is also not so easy to get.
From the seed to coffee in cup, every step would experience changes, would a cup of high quality cup of coffee come into being.
While the shelflife of a roasted coffee bean is very limited,the best flavor would be no more than 30 days,after that,it would be of no meaning to taste.
Different from normal product,the water proportion of the coffee bean is very low,it's not so easy to go bad.Though it's not the best time to taste,the nutrition still exist.So it's not advised to throw away.
And the coffee ground after being extracted can also be resued .