When answering this question, you can talk about the typical age or stage when children start to form their own opinions. Usually, children begin to develop independent thinking and personal preferences during early childhood, especially around the age of 5 to 7, when they start school and interact more with others. You can also mention that as children grow older and gain more experiences, their opinions become stronger and more independent. It’s also good to point out that every child is different, so the exact age can vary.