Additional articles on online gambling (e.g., from references) were later included.

A systematic rapid review was conducted by searching eight databases. This article explores age restrictions and other harm reduction measures relating to youth and young adult online gambling. Vulnerable youth may be particularly at risk due to limited harm reduction and enforcement measures. Internet gambling has become a popular activity among some youth.

9Campbell Family Mental Health Research Institute, Center for Addiction and Mental Health, Toronto, ON, Canada.

8Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada.

7Department of Neuroscience, Yale University, New Haven, CT, United States.

6Connecticut Mental Health Center, New Haven, CT, United States.

5Connecticut Council on Problem Gambling, Wethersfield, CT, United States.

4Department of Psychiatry and Child Study Center, Yale University School of Medicine, New Haven, CT, United States.

3JHU Global mHealth Initiative, Department of International Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, United States.

2School of Rehabilitation Science, McMaster University, Hamilton, ON, Canada.

1Institute for Mental Health Policy Research, Center for Addiction and Mental Health, Toronto, ON, Canada.

Jing Shi 1,2 * Michelle Colder Carras 3 Marc N.

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