But there is no such age limit criteria for the exam. 

But there is no such age limit criteria for the exam. 

Yes, there is no age limit specified for DU JAT, but since you have already completed your graduation, it does not have much justification why you would like to repeat your graduation. If you are interested to pursue management education, you can appear for the MBA entrances like CAT/XAT/CMAT etc and take admission in a B-School offering MBA/PGDM programmes.