"It really raises the question of what should be considered normal ageing," says Kenneth Manton, a demographer from Duke University in North Carolina.

北卡罗来纳州杜克大学人口统计学家肯尼斯·曼顿说：“这确实引发了一个问题，即什么是正常的老龄化。”

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"Now, foreigners come to Hong Kong to build a life, " says Paul Yip, a demographer at the University of Hong Kong.

“现在，外国人来香港建立他们的生活。”香港大学的人口统计学家 Paul Yip 说。

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One demographer has said the 300 millionth person would likely be a Latino boy given current U.S. population trends.

美国一位人口统计学家曾说，从目前美国的人口走势来看，这第三亿个人可能会是一个拉丁裔男婴。

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Marc Perry is a demographer and chief of the population distribution branch.

VOA: special.2011.03.14

"Without question, we are becoming a Hispanic state, " said Texas state demographer Lloyd Potter.

CNN: STORY HIGHLIGHTS

"The face of the country is changing, " said Jeffrey Passel, demographer at the Pew Hispanic Center.

CNN: STORY HIGHLIGHTS

Huge time commitments at work, notes demographer Phil Longman, often work against potential parents.

FORBES: Decline Of The Asian Family: Drop In Marriages, Births, Threatens Economic Ascendancy