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The Health State Function theory is applied to find a quantitative estimateof the Human Development Stages by defining and calculating the specific agegroups and subgroups. Early and late adolescence stages, first, second andthird stages of adult development are estimated along with the early, middleand old age groups and subgroups. We briefly present the first exit time theoryused to find the health state function of a population and then we give thedetails of the new theoretical approach with the appropriate applications tosupport and validate the theoretical assumptions. Our approach is useful forpeople working in several scientific fields and especially in medicine,biology, anthropology, psychology, gerontology, probability and statistics. Theresults are connected with the speed and acceleration of the deterioration ofthe human organism during age as a consequence of the changes in the first,second and third differences of the Health State Function and of theDeterioration Function.  Keywords: Human development stages, Deterioration, Deterioration function,Human Mortality Database, HMD, World Health Organization, WHO, Quantitativemethods, Health State Function, Erikson's stages of psychosocial development,Piaget method, Sullivan method, Disability stages, Light disability, Moderatedisability, Severe disability stage, Old ages, Critical ages.

A Quantitative Method for Estimating the Human Development Stages by  Based on the Health State Function Theory and the Resulting Deterioration  Process