Meaning of the word "a fool at forty is a fool indeed" in English

What does "a fool at forty is a fool indeed" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

a fool at forty is a fool indeed

US /ə fuːl æt ˈfɔːrti ɪz ə fuːl ɪnˈdiːd/
UK /ə fuːl æt ˈfɔːti ɪz ə fuːl ɪnˈdiːd/
"a fool at forty is a fool indeed" picture

Idiom

if a person has not gained wisdom or maturity by the age of forty, they are likely to remain foolish for the rest of their life

Example:
He is still making the same reckless financial mistakes; truly, a fool at forty is a fool indeed.
You should have learned from your past by now, because a fool at forty is a fool indeed.