When the person was 6 years old, the sister was half that age:
6 ÷ 2 = 3
This means the sister is three years younger. The age difference between siblings never changes.
Now that the older sibling is 70, subtract the same three-year difference:
70 − 3 = 67
The correct answer is 67 years old.
A common mistake is dividing 70 by two, but the sister was half the person’s age only at that earlier moment—not throughout their lives.
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