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Genomic data from about 70, women were analyzed to identify protein-coding variation associated with age at natural menopause. Others have proposed that the postponement process itself constitutes a separate 'third transition'. European Journal of Population. There are many factors that may influence childbearing age in women, although they are mostly correlations without certain causations. Two studies show that generous parental leave allowances in Britain encourage young motherhood and that parental-leave allowance reduces postponement in Sweden. Biodemography and Social Biology. However, over time, improvements in and improvements in access to medical services and social resources have decreased the negative association between older maternal age and low birth weight. Women with an inherited mutation in the DNA repair gene BRCA1 undergo menopause prematurely, [29] suggesting that naturally occurring DNA damages in oocytes are repaired less efficiently in these women, and this inefficiency leads to early reproductive failure. The risk of the mother dying before the child becomes an adult increases by more advanced maternal age, such as can be demonstrated by the following data from France in [15].

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