Device lifecycle is the period a device remains in active use before it is replaced, recycled, or resold. In cyber security, the lifecycle matters because every phase can expose data and access: setup, daily use, repair, transfer, and retirement. A device that stays in service longer may collect more accounts, cached credentials, cloud sessions, and personal files, which increases the impact if it is lost, stolen, or passed to someone else.
Attackers often target weak points in the lifecycle, such as forgotten logins on old hardware, unpatched software on aging devices, or incomplete data wipes before resale. Defenders reduce risk by updating firmware and apps, using multi-factor authentication, reviewing active sessions, encrypting storage, and fully erasing devices before disposal or resale. Good lifecycle management treats a device like a long-lived endpoint, not a disposable gadget.