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》

People have always focused on maternal age, but now we know that paternal age matters, too.

人们总是关注母亲怀孕的年龄，但是现在我们知道父亲的年龄也是非常重要的。

youdao

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；

youdao

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