The "Spectrum Alarm Notification Manage (SANM)" section of the documentation defines the "Age Time" parameter as follows:
(Optional) Indicates the time for which the filter holds the alarm. The alarm passes to the alarm processing application after the age time.
Basically, when the alarm passes a filter, SANM will hold the alarm for the specified time. If the alarm still exists (has not been cleared automatically or by the user) after the time has expired, then SANM will forward the alarm to the AlarmNotifier application for further processing.
If the alarm has been cleared before the time has expired, SANM will not forward the alarm to the AlarmNotifier application.