[Morphometrically definable aging velocities of cells and tissues]

We determined aging changes of the nucleus-cytoplasm-relation in the epithel of the human epiglottis and intestine of rats. The results were compared with data about the proliferation of connective tissue and the decrease of muscle cells in the wall of the intestine and in the ciliary muscle. We adapted exponential functions to the measured results. For comparing the several equations and the derivable aging velocities, the nucleus-cytoplasm-relation must be transformed into nucleus volume rate of the total cell volume. Similarities in the decrease of the aging speed in the course of life and in the value of the exponent of the aging function by W. Beier (approximately 0,03) were demonstrated.