Good day Peeps

Please, I need an advice. I wrote waec when I was 13yrs. I passed the exam. But I had to wait for few years to write jamb to enable me gain admission into uni. due to my age. At last, I did after so many years passed. But when I went to collect my original Waec result, I found that there's an error with my date of birth. That is, my date of birth was said to be 20yrs old at the time I wrote the waec exam. Which is not true. please, I would like to know what's needed to be done and hope it won't affect my admission at the uni. In any way? Thanks for your response.