Ключевые слова: adult, age, aged, aging, alone, attractive, balding, beard, blackboard, caucasian, ceo, chalkboard, class, classroom, college, concerned, contemplation, course, elderly, emotion, expression, face, grandfather, gray, green, greyhaired, happy, head, isolated, looking, male, man, mature, mood, old, older, one, pensioner, pensive, person, portrait, profile, retired, retirement, senior, serious, single, thoughtful, wrinkles,