રંગે કાળા કેશ, વેશ ભજવે નહીં વેહેવારમાં;

raṁgē kāḷā kēśa, vēśa bhajavē nahīṁ vēhēvāramāṁ;

Literally: Hair black in color, but not acting properly in conduct;
What it means: External signs of youth or respectability are worthless if one's behavior is improper.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1921) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.