TOEFL is a competent exam that evaluates the English proficiency of applicants, who do not have English as their first language. This is either a computer or a paper-based exam and well-recognized in the North American continent, i.e. the United States as well as in Canada.
There is no restriction based on age or qualifications in taking a TOEFL exam. However, the applicant should at least be 16 years of age and this test is valid up to two years only and universities accept scores which are still valid.