Ключевые слова: 6065, 60s, 6570, 7075, 70s, aged, american, caucasian, city, corridor, down, downstairs, elder, elderly, european, french, german, grandparents, gray hair, indoor, inside, male, man, mature, metro, old, one person, pensioner, person, portrait, public, public transportation, retired, russian, senior, stair, staircase, station, subway, tube, tunnel, underground, urban, walk, walking,