Ключевые слова: academic, adult, aged, audience, authority, beard, concentration, conference, contemplation, education, educator, elder, event, experience, expertise, expression, focused, glasses, grey, hair, indoors, insight, intense, knowledgeable, leader, leadership, learning, lecture, listening, man, mature, mentor, mustache, observation, presence, professional, professor, respected, scholar, seminar, senior, serious, teaching, thinker, thoughtful, wisdom, wise,