Betting on Delaware-based teams (such as the University of Delaware) and high schools is not allowed. Teams you can bet on. You can bet on all professional sports teams and most college teams.Age. To start, you must be 21 or older to bet in Delaware.You can see the full list of rules here, but the following are some highlights to know about: That doesn’t mean, however, that Delaware doesn’t have any rules or limits in place. Delaware now offers Vegas-style sports betting including single-game pets, parlays, teasers, futures, and more.