Question

1. When he was ten, he went abroad.
2. When he was ten years ago, he went abroad.
3. When he was ten years, he went abroad.
4. At the age of ten, he went abroad.
5. At age ten, he went abroad.
5-1. At aged ten, he went abroad.
6. At ten, he went abroad.
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Are they all grammatical? Which ones are ungrammatical? Do you have some other expressions which can be used commonly? Thnak you.

Answer 1

2 does not make sense, but all the others are grammatical. 3 is grammatical, but we would say "ten years old" or "ten years of age", not just "ten years". 2 is wrong. When he was ten years ago? That would be 2005??? If you mean "ten years age", it's still something that we would not say. It should be "ten years of age".