In the process of historic-genetic reconstruction of relief, it is expedient to consider the landforms as three- dimensional geologic objects with the conformai structural and substantial content. At the first stage of reconstruction, the lifetime and signs (positive, negative) of landforms as areas of denudation and accumulation are evaluated. At the second stage, the age estimation is fulfilled with the use of all available information of the genetic types and ranks of landforms, as well as the composition and the age of structural-substantial complexes. At the third stage, it is necessary to reconstruct the general evolution and the sequence of the landforms conversion alongside the analysis of their ancestral features and possible changes in the morphological and genetic characteristics. The absolute dating of the geomorphologic objects is performed only after determining their genotypes and ranks. The absolute (physical) time of forming the most ancient conformal geological complexes serves here as a principal criterion. The term "morphological age" characterizes the stage of the form development and indicates the time of the last phase of active morphogenesis - the phase when landforms have taken the shape close to the current one.