Greetings from the young to the elder in my country is of Paramount importance cus the four major ethnic groups and other thousands of ethnic groups around my country are founded on respect from the younger ones to the elderly ones.
This was made so compulsory that in the 80s,if a child walked pass an elder without greeting him, that child can be summon during elders meetings and strokes of Cain's will be served to correction.
Some ethic group around my country, the child on seeing his elder, will prostrate on the floor still the elder touches his or her back or better still ask him to stand.