[Tombot]

I used a 14 year old girl in krakow as the leader of a band of kids, which carved out a living outside of the citywalls as thiefs. They sometimes worked for the DIA-Boss and (after trying to steal some stuff of the PC´s) as guides for the search of the hideout of Warsawskie-Marauders.

And about children-soldiers... that is a hard one, but that kind of soldier would surely turn up in T2k-times. I did not use them yet, but thought about doing it in the future in the desperate vincinity of the "Zone Morte", where life is even cheaper than elsewhere...
VERY mean topic, surely a brutal twist for the players. Every good man, who stops shooting back for a second ("These are KIDS!"), could bite the dust very fast. Or earn some mental problems, after "overcoming" these attackers... (especially the soldiers which already had children themselves).

And i recently had a group of a dozen children following a fanatical catholic priest, which the players encountered on their way to bremerhaven.
The priest called his group "flaggellants" and they prayed and whipped themselves "for the sins of the past", begging for food, on their way.
(Off course he used ´em as thiefs, and there were hints about sexual abuse, too).
The T2k-world is harsh place, and kid-soldiers are another (real evil) facette of just that.

Addition: Ah - almost forgot! The Warsawskie-Marauders within the citylimits had kid-soldiers! They armed a gang of tough street-urchins to watch the main-entrance of the abandoned trainstation above their HQ! They gave them some weapons and spread the word among the homeless/refugees living in the ruins there, "to shut up or die" about the place and its residents. The kids acted as forward observers, and had the mission to scare away the civilians.
Above that "Adam Zmiski" (one of the marauders) recruited them sometimes as spys for ORMO-activity.
My players managed to rush the kid-soldiers and take them alive, before they surprised the russian deserters in their hide-out.