[Mishlei 16:31][1] states:

> עֲטֶרֶת תִּפְאֶרֶת שֵׂיבָה; בְּדֶרֶךְ צְדָקָה, תִּמָּצֵא
> 
> The hoary head is a crown of glory, it is found in the way of righteousness.



  [1]: http://www.mechon-mamre.org/p/pt/pt2816.htm#31