This. Not taking into account actual age is completely wrong. Age of the respondent is going to show a skewed result (I bet none of your readers are 10 years ol

This. Not taking into account actual age is completely wrong. Age of the respondent is going to show a skewed result (I bet none of your readers are 10 years old...). Does that mean the older sibling is "smarter"? No, it means young people are not your audience...