幼年は英語で
childhood

英語の定義

幼年
1. n. childhood
幼年時代の記憶 - memories of childhood
2. n. (c, ja, Age, Children)

childhood
1. n. (mostly) The state of being a child.
2. n. The time during which one is a child, from between infancy and puberty.
3. n. (by extension) The early stages of development of something.