Mean Value Analysis of the Age of Information in Slotted ALOHA

This letter presents a mean value analysis of the age of information for slotted ALOHA, a widely-used medium access control protocol in communication networks. Unlike previous studies that rely on approximations, we provide exact results for the expected age of information at random slot boundaries and the expected peak age of information. We explore the impact of packet arrival and transmission probabilities on the age of information through a numerical example.