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Children don't complete their set of 20 baby teeth until they are two to three years old.

孩子到两三岁时才长齐20颗乳牙。

《柯林斯英汉双解大词典》

The sixty-three year old coach has had operations to replace both of his hips and has problems with his back and knees.

VOA: special.2009.07.10

Meanwhile, his youth was going away and now this imaginary student is now thirty-three years old never had time to marry or start a normal life.

与此同时，他的青春年华也已经逝去了,现在这位设想出来的同学已经33岁了,还没有结婚也没有开始正常人的生活。

耶鲁公开课 - 金融市场课程节选

Nominees for these academies must be seventeen to twenty-three years old, unmarried and with no children.

VOA: special.2009.06.04

Ferguson paid tribute to a player whose goals have played a large part in bringing three successive titles to Old Trafford.

BBC: Ronaldo completes ?80m Real move

And the ages ranged from three to 75 years old -- we had a big family.

WHITEHOUSE: The White House

Staff have managed to catch the animal, which has been identified as a two to three year old male European Beaver.

BBC: Beaver