Reproductive longevity and increased life expectancy.

Abstract:

BACKGROUND:Female life expectancy in developed countries has increased by 30 years in the twentieth century. AIM:To determine if there has been an increase in reproductive longevity. METHODS:We analysed age-specific fertility data from birth statistics for the USA, Canada, Japan, France, Sweden, the UK and Australia. RESULTS:Since 1940, birth rates for women aged 35 and over have declined. Among women aged 50 years and older, there has been no increase in births. Fertility rates in 1990 were 0.0 to 0.044 per 1000 women, with total numbers ranging from 0 to 60 births. CONCLUSION:The fertile years have not been prolonged in the cohort of women whose life expectancy has increased so dramatically this century. This suggests that reproductive senescence is tightly controlled and not extended by factors that enhance female longevity. Other physiological mechanisms may also be fixed within narrow age limits.

journal_name

Age Ageing

journal_title

Age and ageing

authors

Brody JA,Grant MD,Frateschi LJ,Miller SC,Zhang H

doi

10.1093/ageing/29.1.75

subject

Has Abstract

pub_date

2000-01-01 00:00:00

pages

75-8

issue

1

eissn

0002-0729

issn

1468-2834

journal_volume

29

pub_type

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