Kids below 5 years get a Baal Aadhaar. This Baal Aadhaar is valid till the child reaches 5 years of age. The child's Aadhaar then requires a mandatory biometric update. Take your child to any nearby Aadhaar Kendra for this FREE biometric update. Kids require a second biometric update when they reach the age of 15 years. This is required for updated information of children which will help them in using Aadhaar based authentication services easily.