1970到2000年间，经合组织各国妇女平均生育第一个孩子的年龄，每隔十年就增长一岁；此外，更多妇女在30多岁时才建立家庭。
Between 1970 and 2000 the mean age at which women had their first child in a range of OECD countries rose by more than a year every decade, and many more women now have their families in their 30s.
生育是一个大问题，因为很多女性直到三十多岁才怀孕，现在的第一次生育的母亲的平均年龄是三十岁。
Fertility is an issue because women are delaying getting pregnant until their 30s — the average age now for a first-time mother is 30.
幼儿死亡率的死亡年龄由母亲相继生育的平均时间间隔和婴儿出生登记时的平均年龄决定。
The age at death for early child mortality was determined by the mean interval between successive births and the mean age of neonates at registration.
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