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12-31-57 -2- through. the age of 5 years; elementary school, from age 6 through 11; and the junior -senior high school group, from age 12 through 17. Of the latter group, there were 1508; of the elementary school age, 2570; of the pre- school group, 2896. Assuming that these figures remain constant, it is estimated that by 1961 there will be about a 70 percent increase in the number of junior -senior high school students over the 1508 in this age bracket in 1955 and approximately a 13 percent increase in the number of elementary school pupils over the 2570 -there are in this age group. Similarly, it is estimated that by 1967 there will be about a 92 percent increase in the number of junior -senior high school students in this age class in 1955. In -Migration Other aspects and characteristics of Lexington's present and future population are indicated in a study of migration into Lexington, from 1953 through 1956, of persons twenty years of age or older. It appears that if trends for this period hold steadily, Lexington can expect about 1300 to 1550 new adults moving into town each year. Comparing the age groups of these in -migrants with 1950 census data, it is immediately evident that Lexington is tending more and ' more toward a younger adult population. The 1950 census showed that about 39 percent of the adults were 39 years old or less, whereas the percentage of in -migrants in this same age group rose from approximately 66 percent in 1953 to about 69 percent in 1956. Again comparing the 1953-1956 in -migration study with the 1950 census data, indications are that Lexington is becoming more and more a residential area for professional and technical people and less and less a place of residence for service and operative workers. There has been a corresponding but less of a drop in the percentage of Lex- ington residents who are grouped in the so-called crafts- men -foremen category. To cite an example of this occu- pational trend, the study showed that of those who moved into Lexington from Greater Boston from 1953 through 1956 about 33 percent were in the professional and technical category, 66 percent representing the total percentage of white collar in -migrants from the same area. Rate of Growth In conjunction with rate of growth studies, estimates have been made of the number of inhabitants Lexington will eventually have under present existing zoning by-laws and ' of the approximate years in which most of the total possible dwellings in. this town will have been constructed. Of Lexington's total area of 10,650 acres, about 4180 have been