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middle-aged
中年
elderly
of people 人 used as a polite word for old 年纪较大的，上了年纪的（婉辞，与 old 同义）
childhood
the period of somebody's life when they are a child 童年；幼年；孩童时期
adulthood
the state of being an adult 成年
teenager
a person who is between 13 and 19 years old （13 至 19 岁之间的）青少年，青少年男女
Generation
all the people who were born at about the same time （统称）一代人，同代人，同辈人
early-twenties
二十刚出头
mid-thirties
大约三十五六岁
late-forties
快五十岁
baby toddler
婴儿学步
