Common Usage & Traps
- 几岁 — how old? (aimed at a child, casual)
- 三岁 — three years old
- 二十岁 — twenty years old
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我是三岁我三岁是 has no business in front of an age. The number goes straight after the person.
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我学中文三岁我学中文三年Time spent doing something uses 年, not 岁. 岁 only counts birthdays.