What is the naming etiquette of male seniors and juniors?

In many cultures, male seniors are often addressed with titles that indicate respect, such as "Mr." followed by their last name, or by using their professional titles. Juniors typically use first names or less formal titles when addressing seniors, reflecting a hierarchical relationship. In some contexts, juniors might also use "Sir" or specific honorifics, depending on the formality of the situation. This etiquette emphasizes respect and acknowledges the seniority of the individual.