Every generation develops these habits at a certain age, but Millennials seem to be extending this phase of life as they postpone marriage.

每一代人都会在某个年龄段养成这些习惯，但千禧一代似乎因为推迟结婚而延长了这一阶段的生活。

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While the planetary nebula phase is thought to last for around 10, 000 years, astronomers estimate the age of the outer filamentary portions of this halo to be 50, 000 to 90, 000 years.

虽然行星状星云阶段持续约1万年，天文学家估计其外晕的丝状物质年龄在5万至9万年间。

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We are currently in a not-so-cold phase of an ice age - The Quaternary Ice Age.

BBC: Looking for the greenhouse signal

About 20 thousand years ago, during a colder phase in this ice age, sea level was up to 130 metres lower than at present.

BBC: Looking for the greenhouse signal

In my professional career I encouraged people to go into retirement with a positive attitude and to think of this phase of life as the Third Age.

BBC: What retirement means to you