On n’apprend pas le chemin au vieux gorille (Proverbe Fang – Cameroun, Gabon, Guinée Equatoriale).
You cannot teach the way to an old gorilla (Fang proverb – Cameroon, Equatorial Guinea, Gabon).
Proverbe Fang sur l’Experience / Fang Proverb on Experience
African Heritage 
That’s a good proverb. It also reminds me of the saying “you can’t teach an old dog new tricks.”
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