The two links in post #166 above are a good summary, and offer a couple of additional references.
Marko Tikka's book Terrorin aika [A Time of Terror] published last year is pretty near excellent, but isn't yet available in English, AFAIK.
Tikka has found new information about the flying units of the Whites, largely comprising schoolboys - child soldiers. Many were as young as 12 and 13; the youngest Red to fall was just nine.
"Child soldiers were not considered a morally questionable phenomenon - quite to the contrary", Tikka points out. He says that children and youths were particularly cruel in their fighting, because they lacked a developed sense of empathy, and the awareness that their actions had consequences.