成せい人じん期き

Meanings

1

adulthood; adult period

Refers to the stage of life after adolescence, typically from around age 20 onward in Japanese contexts.

成せい人じん期きに入はいると、責せき任にんが増ふえる。
When you enter adulthood, your responsibilities increase.
彼かれは成せい人じん期きのほとんどを海かい外がいで過すごした。
He spent most of his adult life abroad.