mature experience; wisdom of age
A rare yojijukugo describing the deep, well-rounded experience and insight that comes with advanced age. Used in literary or formal contexts.
Judgment born of mature experience is something young people cannot imitate.
円熟 alone means 'maturity' or 'ripeness' and is more common; 老成円熟 adds the nuance of age and experience.
老成 means 'precocious' or 'mature beyond one's years'; 老成円熟 combines this with 円熟 to emphasize well-rounded maturity from age.
A yojijukugo combining 老成 (precocious maturity, seasoned) and 円熟 (mellow, ripe). The exact origin is uncertain, but it follows the pattern of four-character compounds expressing ideal states of character.