Ключевые слова: academic, adult, blackboard, chalkboard, class, classroom, copy space, copyspace, education, elderly, exam, front, grandfather, grey hair, indoor, intelligent, job, knowledge, learn, learn lesson, learning, lecturer, lesson, male, mature adult, mentor, occupation, old, old senior, oldage, older, professor, retirement, school, science, seminar, senior, senior professor, standing, studying, suit, teacher, teacher class, teachers, teaching, think, thinking, tutor, tutor study, university,