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When was the last time you received an email from your bank to update your personal data stored in the bank database? The inconvenient truth that data has an age! The destination, in this case the bank, associates an age (typically a few years) with your data. If the peak age is reached, request is sent out requiring a status update message from you. The age of your data on the bank database is reset after receiving the update. The talk is about age of data in IoT-based systems.

Modern distributed applications like crowdsourcing and blockchains require data with the minimum possible age. Such fresh data will ensure a high quality of the decisions made using these applications. In this talk, the concept of Age of Information (AoI) is introduced. It will be shown how this new metric will play a role in current and future intelligent and secure systems. Several mathematical formulations will be given using the topic of Markov decision processes to show some recent applications of the AoI metric.