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In Western and European cultures where marriage and parenthood are increasingly delayed to the late twenties and early thirties, a distinct developmental stage between adolescence and adulthood has been described as “emerging” or “young” adults. Development theory suggests that these “younger” adults have less social control and exercise higher levels of impulsivity and risky behavior than thei...

Describing and analysing age patterns of vital events is one of the fundamental concerns of demography. Since the time the documentation of vital events began, the shape of mortality curve by age has puzzled the inquisitive mind. Its shape tended to vary with space and time. When attempts to capture the age variation in mortality by a single mathematical formula with only a few parameters prove...