This read-write Unsigned32 sets, in days, how long a line password remains valid for login before it's considered expired, with a value of 0 meaning the password never expires; the actual usable range depends on the specific product. After this period elapses, the system may still allow a limited number of logins solely to let the user change the password. An admin configuring password aging policy for a console or vty line sets this object to, for example, 90 days to enforce periodic password rotation.