parameter is justified by the observation of shrinkage associated with aging and the subsequent material density variation as well as a change of the resonance atomic frequencies and characteristic relaxation times measured in macroscopical studies. In other words, the internal length and time scales change with aging when compared to the corresponding absolute (physical) scales. The most sensitive indicator of aging is a variation of an intrinsic material time scale. The measurement of time in the laboratory as well as in material (intrinsic time) can be accomplished by several methods, the most common of which is the use of oscillating processes such as those found in clocks with a pendulum or crystal-based timepieces. Another way of measuring time is the use of a unidirectional evolution of state. In medieval Europe, for example, time was measured by burning a candle which had numbered and colored beeswax strips. Still another method is associated with relaxation processes which require an excitation input to enable a fading response. Electronic relaxation generators employing the discharge of a capacitor and the fading luminescence of phosphorus are both examples of relaxation processes, which are well suited for measuring intrinsic time scale changes because they reflect atomic or 