幼時|ようじyouji[1]atamadaka (head-high)

1. no-adjective, adverbchildhood; infancy

• Synonym幼年時代ようねんじだいNeutralRefers to the childhood period itself and works in both speech and writing; 「幼時」 is the more concise, bookish option.
• Synonym幼年ようねんNeutralDenotes the age range itself rather than the period; also used for the youngest class below junior in sports and the like.
• Synonym幼児期ようじきWrittenA written/formal term for ages one through six, favored in developmental psychology.
• Synonym幼年期ようねんきWrittenA written/formal term for the childhood stage of human development; figuratively, the initial stage of landform erosion cycles.
• Synonym小児期WrittenA written/formal medical and psychological term for childhood; more academic in flavor than 「幼時」.
• Related児童期WrittenA written/formal education term for the school-age stage of childhood.
• Antonym老年ろうねんNeutralOld age, the stage of life at the opposite end from the childhood years of 「幼時」.
• Antonym晩年ばんねんWrittenA written/formal word for one's later, final years — the opposite end of life from 「幼時」.

In everyday speech say 「子どもの頃」; 「幼時」 is the concise written word, as in 「幼時の記憶」. For academic contexts use 「幼児期」 or 「児童期」. For the opposite end of life, 「晩年」 is the written choice for one's final years.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 幼年ようねんの時代じだい。