How long will it take to keep the coffee? can I still drink the expired coffee?

Coffee, which has attracted a lot of attention, will also have its own shelf life. With regard to the shelf life of coffee, some people say that it is a month, some people say it is several months, and some even say it is a year. Is there any basis for these claims? Let me tell you more about the coffee in front of the street. The flavor of coffee is different in different periods of time, and the freshly roasted coffee beans will appear.