Synonyms for the phrase "old boy" are plentiful, and they include numerous terms that can be used to describe a male with a certain level of experience, wisdom, and age. Some of the most common terms include "elder statesman," "veteran," "wise man," "senior," and "seasoned professional." Other synonyms that can be used to describe an older man include "sage," "venerable," "patriarch," "graybeard," and "grandfather." Each of these terms can be used to convey a certain level of respect, admiration, and authority associated with men who have lived a full life and acquired knowledge and experience to share with others.