Although the ages for uijin varied from person to person, in many cases the participants were in their early teens around genpuku (coming of age ceremony) and the parents were inclined to send them to a battle that they would doubtlessly win, wishing for their safety.
初陣の年齢は個人差があるが多くの場合、元服前後の10代前半が多く、親は子供の将来の安寧を願い必ず勝てる戦いに参加させる傾向があった。