Is youth flag football safer than tackle? The results of this study may surprise you.
Conclusion: Injury is more likely to occur in youth flag football than in youth tackle football.
From the Mayo Clinic:
The risk of injury in youth football does not appear greater than the risk associated with other recreational or competitive youth sports.
An article quoting the Mayo Clinic
"Our analysis showed that youth football injuries are uncommon.
Injuries in Youth Football: A Prospective Observational Cohort Analysis Among Players Aged 9 to 13 Years
NY Times: NFL Players Live Longer Than Other Men