Assistance in Gaining Experience, Independence, and Navigation Act of 2013 or the AGE-IN Act - Amends the Public Health Service Act to direct the Secretary of Health and Human Services (HHS) to make a grant to a research organization to: (1) conduct a comprehensive analysis of research on the topic of youth and young adults with an autism spectrum disorder or other developmental disability as such individuals age out of the school-based support system (transitioning youth), (2) conduct research on the existing infrastructure for transitioning youth, and (3) develop a comprehensive strategic plan for the establishment of a Transition Navigator grant program to provide transitioning youth with a comprehensive and interdisciplinary set of support services.

Directs the Secretary to establish a Transition Navigator Grant Program to award multiyear grants to establish and carry out a collaborative, interdisciplinary training and services initiative to train transition navigators to provide transitioning youth with the services and skills necessary to lead an independent, integrated life. Provides procedures for evaluation of grantee success in meeting the goal of the strategic plan submitted under this Act.