Furthermore, humans have their own unique life cycle stages. There are four life cycle stages common to all great apes: “infant,” “juvenile,” “adult,” and “old age.” In addition to these, only humans have a “childhood” 1 stage between “infant” and “juvenile,” and also an “adolescent” 2 stage between “juvenile” and “adult.”
In addition, as we will discuss later, the “long post-menopausal age” is also unique to humans.
■References (Books, papers, Web articles, etc.)
『サルの生涯、ヒトの生涯——人生設計の生物学』 デビッド・Ｓ・スプレイグ （京都大学学術出版会、2004）
『家族進化論』 第4章・第9節 人類の生活史と進化 山極寿一 （東京大学出版会、2012）
1The stage in which humans have weaned, but cannot yet eat the same solid foods as adults.
2The stage in which humans have reached sexual maturity, but have not yet actually started breeding.
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