Could you stay home alone when you were 7 years old?
Yes, I could. / No, I couldn't.
Could you cook when you were 3 years old?
Yes, I could. / No, I couldn't.
Could you read when you were 2 years old?
Yes, I could. / No, I couldn't.
Could you swim when you were 4 years old?
Yes, I could. / No, I couldn't.
