When you were six years old, your sister was three years old. 
This means that your sister is three years younger than you. 
Now that you are 70, your sister is 67 years old, considering the same birth year. 
However, the actual age of your sister might be different, depending on the exact birthdates of both of you. 
For instance, if your sister has already had her birthday for the year and you haven't, then she would be 68. 
On the other hand, if she hasn't had her birthday for the year, but you have, then she would still be 66.
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