I’m uninterested in assigning blame in a moralistic black and white way. I think Israel shares responsibility. The UN certainly thought so in the case of Colombia, which I previously quoted. The use of child soldiers by non-state actors still is the responsibility of the state.
As for the male/female longevity argument, let’s look at Israel:
0-14 years: male 1,200,721/female 1,146,556
15-64 years: male 2,839,124/female 2,737,054
That same radical drop off in the male population does not exist in Israel, males outnumber females in both age cohorts. That male/female longevity divergence kicks in after 65, which is why the CIA fact book separates those age cohorts.