Maternal age affects the baby's survival rate.

母亲的年龄影响婴儿的成活率。

《牛津词典》

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socioeconomic factors including poverty, overcrowded housing, sole parenthood, young maternal age;

社会经济因素，包括贫困、住房拥挤、单亲、母亲过于年轻；

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But the increased risk is small. Only five percent of the increased risk is attributed to maternal age.

VOA: standard.2010.02.10

She added that further research was required to find out how induction affects pregnant women "of advanced maternal age".

BBC: 'Induce older mums early to cut stillbirth risk'

In their paper, the authors said there was a proven link between advancing maternal age and increased risk of complications during pregnancy - and a strong link with increased risk of stillbirth and neonatal death.

BBC: 'Induce older mums early to cut stillbirth risk'

My genetic heritage had flaws: My father had a triple bypass at age 66 and my maternal grandfather died of a heart attack at age 56.

FORBES: Extreme Fitness For A Hardcore Economy