Dear Suneela, GRE and TOEFL are the tests to assess your language proficiency to apply for admissions into various courses abroad. There is no specific eligibility criteria for GRE. In other words, there is no age and qualification criteria for GRE. You can write it any time. For more information on GRE, please visit the page at: https://studyabroad-careers360-com.cdn.ampproject.org/v/s/studyabroad.careers360.com/articles/gre-eligibility-criteria/amp?amp_js_v=a2&amp_gsa=1&usqp=mq331AQECAFYAQ%3D%3D#referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fstudyabroad.careers360.com%2Farticles%2Fgre-eligibility-criteria

The same applies to TOEFL as well. Generally a student who has passed high school or equivalent exam can take this test. Please visit this page for information on TOEFL. https://studyabroad-careers360-com.cdn.ampproject.org/v/s/studyabroad.careers360.com/articles/toefl/amp?amp_js_v=a2&amp_gsa=1&usqp=mq331AQECAFYAQ%3D%3D#aoh=15461477946957&amp_ct=1546147841130&referrer=https%3A%2F%2Fwww.google.com&amp_tf=From%20%251%24s&ampshare=https%3A%2F%2Fstudyabroad.careers360.com%2Farticles%2Ftoefl