The Revolutionary Armed Forces of Colombia (FARC) agreed to "implement departure of those under 15 years of age as soon as terms are agreed upon," the parties said yesterday in a statement in Cuba, which is hosting peace negotiations.
Among the terms that must be decided is how the children will be transitioned and reintegrated back into society.
News of the agreement comes as the FARC and Colombia work on terms of a bilateral and definitive ceasefire, one of the last major points before a peace deal can be struck to end Latin America's longest-running and last civil war.
After progress this week in talks, President Juan Manuel Santos said on Friday that he hoped the war with FARC would end "very soon."
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Interior Minister Juan Fernando Cristo said on Wednesday that peace talks were in the "home stretch" and that Colombia plans to hold a referendum on the deal by September.
The Colombian conflict has drawn in several leftist rebel groups, right-wing paramilitaries and drug gangs.
It has left 260,000 people dead and 45,000 missing, while another 6.6 million have been uprooted. Human rights groups say atrocities have been committed on all sides.