十 代(じゅうだい)

じゅうだい

noun

teens; teenage years; one's teens

time-general

1. teens; teenage years; one's teens

The period of life from age 10 to 19. Used to refer to teenage years in general or to someone who is a teenager.

十代(じゅうだい)の頃(ころ)を思(おも)い出(だ)す。

I recall my teenage years.

十代(じゅうだい)の若者(わかもの)に人気(にんき)のブランドだ。

It's a brand popular with teenagers.

彼女(かのじょ)は十代(じゅうだい)の後半(こうはん)からプロとして活躍(かつやく)している。

She has been active as a professional since her late teens.

十代(じゅうだい) refers to the teenage years (ages 10-19). Part of the 〜代(だい) pattern used for all age decades.

Age decade pattern

十代(じゅうだい): teens (10-19)
二十代(にじゅうだい): twenties (20-29)
三十代(さんじゅうだい): thirties (30-39)
And so on for each decade

Common collocations

十代(じゅうだい)の若者(わかもの): teenagers
十代(じゅうだい)の頃(ころ): during one's teens
十代(じゅうだい)前半(ぜんはん): early teens (10-14)
十代(じゅうだい)後半(こうはん): late teens (15-19)

Usage

Unlike the English word "teenager" (13-19), 十代(じゅうだい) technically includes 10-12 year olds as well. In practice, context usually makes the intended range clear.

general

Added 2026.3.11 17:04 · Revised 2026.9.4 9:35

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