Iowa allows young residents (below 16 years) to hunt without a license. For safety purposes, however, they should be in the company of a licensed adult. Young non-residents cannot enjoy this privilege but there is a special youth license for them.
Other than the resident and non-resident licenses, these are the other categories offered: youth hunting license, senior hunting license, disability and military/veteran hunting license.
There are approved retailers all over the state from whom you can get your license. For convenience, visit the website for the department of natural resources.