`The word vrddhasrayam is very significant in this verse. Vrddha refers to one who is advanced in
knowledge. There are two kinds of old men--he who is advanced in years and he who is experienced in
knowledge. One who is advanced in knowledge is actually vrddha (jnana-vrddha);
one does not become
vrddha simply by advancing in age.
Vrddhasrayam, a person who takes shelter of a superior person who is advanced in knowledge, can acquire all the good qualities of a brahmana and be trained in good behavior.`
-Quoted from His Divine Grace A.C. Bhaktivedanta Swami Prabhupada (4th Canto Srimad Bhagavatam)