From around 8 years old (depending on the child), this is probably an accurate assumption. Many children younger than that do not have a fully-developed theory

From around 8 years old (depending on the child), this is probably an accurate assumption. Many children younger than that do not have a fully-developed theory of mind to understand different perspectives on the same issue. This may not matter too much for natural science topics, but it does impact their ability to comprehend social or political issues.