There are no such eligibility traits one should need to hold if he/she wants to take the GRE test. Any person who is planning for a graduate programme or law programme or business program in abroad university can give GRE test. Anybody can take GRE test as there are no ordered qualification and age limits for GRE. The test takers must have an undergraduate degree as GRE is an assessment test for ingress to graduate courses. As there is no specific age limit, you can take GRE whenever you feel like you are ready for it but you need to have is an original passport. This GRE score will be valid for the next 5years.