One of the outstanding characteristics of the third-world countries is the ADOLESCENCE of their POPULATION, referring to the age group below 15 years old. POPULATION ADOLESCENCE is, by itself, regarded as a complex social problem in the third-world countries. This problem is manifested in different dimensions both at present and in future; furthermore, it brings failure or deficiency to many future plans.The age composition of POPULATION is related to the degree of development in different countries. This means, the more a country is developed, the more its POPULATION below 15 years old decreases and the more it is added to the POPULATION of the other two groups. The founder of this idea is Wertheim, the Dutch demographer and sociologist. In his view, at least 40 percent of the underdeveloped countries POPULATION are below 15 and accordingly the test of %40 or Wertheim test has been introduced.In this study, two indices of Wertheim and Vernet have been implemented to identify ADOLESCENCE in Iran's POPULATION. Statistics are based on 1956-2006 censuses. Iran's POPULATION has turned to be adolescent within 1956-1966. The ADOLESCENCE intensity has increased in 1976-1986 interval having a more logical rate within 1966-1976 period.Eventually, this intensity has gradually decreased in 1986-1996 having a more decrease rate within 1996-2006 interval.The ADOLESCENCE or agedness of POPULATION, in principle, causes diverse problems in respect to social and economical planning especially in national investments. About %50 of adolescent POPULATION in a thirdworld country are just consumers having no roles in production and its increase rate. In adolescent POPULATIONs the death rate in children is so high and life expectancy is considerably low. The adolescent composition of a given POPULATION needs vast investments to provide the age group below 14 with sanitation, education, welfare and housing.

To assess the association between regular physical activity in ADOLESCENCE and leisure-time physical activity in adulthood, with emphasis on gender differences among the urban POPULATION of Tehran, Iran. A POPULATION- based cross-sectional study was carried out on an urban POPULATION of 200 persons under the age of 20 years and above 55 years via cluster sampling in local zone of Tehran (3area), in 2008.We interviewed them by IPAQ (International Physical Activity Questionnaire) for evaluated leisure-time physical activity levels. Data on adolescent physical activity were based on subjects’ recall. Of 200 subjects interviewed, 67% were classified as adequately active, and 23.5% reported regular physical activity in ADOLESCENCE. Subjects who engaged in regular physical activity during ADOLESCENCE were more likely to be adequately active in adulthood (adjust prevalence ratio: 0.225, 95%, 667.1). This effect was stronger in women (adjust prevalence ratio: 0.225, 95%, 1.321) than men (adjust prevalence ratio: 0.225, 95%, 1.3333). Furthermore, physical inactivity was more prevalent in the higher socioeconomic group. Promoting physical activity in school age may be a successful intervention against the epidemic of adult inactivity. Although women were less likely to report regular physical activity in ADOLESCENCE, the effect of this experience on adult behavior was stronger than men specially in employment. (64.4% in men and 57.8% in women). Also, the level of physical activity in urban POPULATION of 3rd area of Tehran was low. High risk is associated with employment, retirement, high socioeconomic class and higher levels of education.

A- The goal of this survey is to negotiate the causes of increasment of psycho-social problems in the ADOLESCENCE Field.We have purposed to evaluate and categorize 95 persons who were self - referred or refrnal from legal system to crisis - intervention of welfare organization.These Persons were classified into three groups through neurologic - psychologic - psychiatric approach:1- ADOLESCENCE and Risk - Taking behaviors of Identity crisis.2- Delinquency3- Prostitution:B- Results of approach:1- %30.53 of cases were subclassified under diagnosis of Risk - Taking behavior, identity crisis (which are temporary and abating increasing of age) and Family, supportive system problems.2- %16.84 of cases were subclassified under diagnosis of conduct disorder, Borderline and antisocial personality disorder.3- %13 cases were subclassified under diagnosis of Major or minor psychiatric disorders such as psychoses, Major Mood Disorders and IQ deficiencies.