Any resident of India, Non Resident Indian (NRI) or any foreign citizen residing in India can apply for Aadhaar. Since Aadhaar is meant for establishing unique identity and not for granting citizenship, even NRIs and foreign citizen residing in India can enjoy the benefits of Aadhaar. However, they all must have to go through the verification process as carried out by the UIDAI. Their physical presence is must for giving their demographic and biometric information at any authorised Aadhaar enrolment centre in India.
An individual of any age can apply for Aadhaar number. A child of age less than 3 years does not require giving biometric information and in this case Aadhaar will be linked to the parents or guardian of that child. However, that child needs to give his/her biometric information when he is of 5 years in age. For a child who has enrolled for Aadhaar and is of the age of 5 to 15 years has to give his/her biometric information again when his/her age becomes 15 years. This process of re-registering is necessary because the biometrics of a person changes with age. The biometrics of a person will be different when he is a child and when he will be an adult.