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Age-of-Information is a concept that characterizes the freshness of the information. Fresh information is critical for two types of real-time applications:

It does not refer to the Information Age that we live in.

It is defined as the time difference between the generation time and usage time of the information.

This concept was proposed in the studies of real-time database in 1990s, and has recently seen renewed interest due to the proliferation of real-time applications.

Age-of-Information, or simply the age, is the the time difference between the generation time and usage time of the information data.