Volume 13 - Article 3 | Pages 63-82

Age-specific contributions to changes in the period and cohort life expectancy

By Vladimir Canudas-Romo, Robert Schoen

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Date received:14 Mar 2005
Date published:19 Aug 2005
Word count:4168
Keywords:age-specific decomposition, cohort life expectancy, gap and lag, life expectancy, mortality models, period life expectancy


Period life expectancy has increased more slowly than its cohort counterpart. This paper explores the differences between life expectancies at a given time (the gap) and the time required for period life expectancy to reach the current level of cohort life expectancy (the lag). Additionally, to understand the disparity between the two life expectancies we identify and compare age-specific contributions to change in life expectancy. Using mortality models and historical data for Sweden, we examine the effect of mortality changes over time.
Our results indicate that the widening of the gap between the two life expectancies is primarily a consequence of the dramatic mortality decline at older ages that occurred during the twentieth century. These results imply that the divergence between the two measures is likely to become even greater in the future as reductions in deaths are concentrated at older ages.

Author's Affiliation

Vladimir Canudas-Romo - University of Copenhagen, Denmark [Email]
Robert Schoen - Pennsylvania State University, United States of America [Email]

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