Age-dependent extinction (IMAGE) University of Kansas Caption Younger species are generally at greater risk of extinction. A new model from the University of Kansas shows this newer finding of age-dependent extinction while also emphasizing the importance of zero-sum competition in explaining extinction, as in the older Red Queen theory. Credit Saulsbury et al Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.