Probably not the only factor, but 10's about the age when suicide becomes more than a very, very remote possibility.

https://www.cdc.gov/mmwr/preview/mmwrhtml/figures/m6128qsf.g...

U.K. data but accidents and cancer exceed intentional self harm for teenagers.

https://stateofchildhealth.rcpch.ac.uk/evidence/mortality/ad...

The overlapping decreasing line curves of mortality due to infant / child mortality cases and increasing line curves of mortality due to external factors, accidents, and illnesses. The lines cross around 10 yrs old.

While that's true, these are small death probabilities. The age 10 death probability is less than 1 in 10,000. It doesn't even reach 1 in 1000 until age 20 for men and age 34 for women. According to this data source[1] there are about 4 million 10-year olds. That works out to less than 400 deaths for the entire US in a year.

What I find interesting is the divergence at age 10 by gender. By the late teens, boys are about 2.5 times more likely to die, in spite of the probability being the same at age 10.

[1] https://www.statista.com/statistics/241488/population-of-the...

I wonder if it's accidental behavior because of not knowing better (children crawling into water or streets etc) combined with accidental behavior because of being teenagers crossing over.