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age composition age group American average baby boom birthrate births per woman capita Census changes Charles child childbearing children per woman cohorts concern consequences continue contraception costs countries Dean Cohen decade demographic dependency ratio develop economic growth effect environmental Estimates expected federal fertility rates fifties future growth rate health expenditures higher historical immigration impact implications of population important income industrial labor force less low fertility major marriage ment million Moskowitz Memorial Lectures negative population growth nomic number of births Old-Age and Survivors older persons percent political popu Population Bomb population policy population projection President problems Professor of Economics Professor Westoff proportion rate of population recent result retirement age seems significant social security stationary population three-child tility timated tion tive trends ulation United University of Michigan welfare women York University young zero population growth