In Iowa, you must be at least 21 years old to gamble at casinos. This age restriction applies to both online and land-based gambling activities. The legal age limit is strictly enforced to prevent underage gambling and protect young individuals from potential harm. It is important to have a valid ID to prove your age when participating in any form of gambling in Iowa. Make sure to adhere to the age requirements to avoid any legal consequences or penalties. Be responsible and always gamble within the legal limits.