Age

The age at which the failure of a specific unit of an item is observed and reported.

The characteristics exhibited by the conditional probability curve represent the relationship between the operating age of an item and its probability of failure.

A conditional-probability curve which represents the age-reliability relationship of certain items, characterized by an infant mortality (early life failure) region, a region of relatively constant reliability (rarely occurs in reality), and an identifiable wear-out region.

The probability that an item will fail during a particular age interval, given that it survives to enter that interval.

A life limit imposed on an item to reduce the frequency of age-related failures that have economic consequences.