The virtual age is the age of the system after maintenance, and is given by . Thenotion of virtual age is appealing if you compare it to the calendar age. We can viewthe virtual age as an indicator of an objects current state. This way, it becomes anaggregated, overall characteristic. There exist a similar notion referred to as thebiological age. It is used in life sciences quite often, but without employing the use ofa proper mathematical formalization. If, maybe, someone has vital characteristicssuch as blood pressure, cholesterol level, among others as those of somebodyyounger, then their health state definitely corresponds to a younger age. Contrary tothat, no justified ways exists of making this statement precise, given that the state ofhealth of an individual is defined using numerous parameters. However, thecorresponding formalization can be performed for some simple, ageing engineeringitems|[2]. The term "virtual age" was initially defined as the corresponding"equivalent" age of a repairable item if a repair is imperfect [1].Virtual age can be comprehended as an aggregate index of the system state space S. Ithas long been noticed by researchers that the chronological age as an element of thestate space S does not always reflect the systems instincts. Consider three cars of thesame make which started operation at the same time, maybe, on Jan 1st, 1998, by the31st Dec, end of year 2000, both the cars mileage meters indicated 100,000 km. The ...
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