If you thought Jake Paul was done taking on much older opponents, think again ... 'cause his next opponent was born long before the United States of freakin' America was founded -- a 392-year-old shark!!
El Gallo made the silly declaration on social media on Thursday ... joining in on the running joke about his knack for fighting people who have been around a lot longer than him.
In case you missed it, one X user shared a post about an alleged ancient shark that's been chilling in the Arctic Ocean since 1627 .