老ろう成せい円えん熟じゅく

Meanings

1

mature experience; wisdom of age

rare termyojijukugo (four-character idiom)

A rare yojijukugo describing the deep, well-rounded experience and insight that comes with advanced age. Used in literary or formal contexts.

老ろう成せい円えん熟じゅくした判はん断だんは、若わか者ものには真似まねできない。
Judgment born of mature experience is something young people cannot imitate.