This read-write INTEGER (0-365 days) determines whether password aging is applied, with 0 disabling aging, and it notes that actual aging only takes effect once the device has a real-time clock set, either manually or via SNTP. An admin cares because forcing periodic password changes is a security control, but it silently won't work on a device whose clock has never been set. For example, an admin enabling 90-day password aging would also need to confirm SNTP or manual clock configuration is in place, otherwise the aging policy configured here will never actually trigger.