Matching Pairs the stages of human lifeOnline version Match the characteristics to the stages of human life cycle by Arlen Zúñiga 1 At this stage, aging begins. 2 At this stage humans reach sexual maturity. 3 This stage starts from birth. 4 At this stage, we develop reading, speaking and writing skills. 5 At this stage the secondary sex characteristics appear. 6 At this stage, the ability to reproduce is reduced. Adolescence Childhood Adulthood Adulthood Childhood Adolescence