The optimum IQ test age is between 5 and 8 years old. Toddler IQ testing isn't accurate, but parents can support young children's development at home. You may suspect your child is quite bright, but ...

Psychologists administer IQ tests. Some psychologists don't test children younger than 4. Costs for testing can vary by the provider. Isla McNabb, a 2-year-old from Kentucky recently became the ...