Going to war is basically suicide. You go into war knowing very well that you can die at any moment and that your entire life is at risk. The war is extremely dangerous and puts everyones lifes at risk and thousands of people die at war everyday because of it.
The statistics that we point at when we look at younger drivers do indicate that younger drivers are responsible for many accidents. Many of those accidents are due to reckless behavior, things that older people are more cautious about or more skilled at avoiding. However, a lot of those statistics target drivers aged 16 to 19, grouping them together. Since raising the driving age to 18 would not age a person out of this risk category, I do not think it would matter very much statistically.