מפני שיבה תקום והדרת פני זקן
In the Talmud Kiddushin 32b, a Tannaic dispute is presented concerning a zakein ashmai, iniquitous elder, whether if one must honor him or not. Rashi is the one who defines ashmai as iniquitous. Tosfos disputes this, since it is a mitzvah not to respect an iniquitous elder. Such a person warrants disrespect. Therefore, Rabbeinu Tam explains ashmai to mean a boor, an ignoramus, one who is otherwise unworthy of respect. Nonetheless, since when are we enjoined to respect an ignoramus, simply due to his advanced age? One must earn respect, be worthy of the reverence accorded him by others. True,…