( saying ) an older person who behaves in a stupid way is worse than a younger person who does the same thing, because experience should have taught him or her not to do it
(THERE'S) NO FOOL LIKE AN OLD FOOL
Meaning of (THERE'S) NO FOOL LIKE AN OLD FOOL in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005