Keywords
70-75 years, beard, blackboard, button down shirt, casual clothing, caucasian ethnicity, chalk, characters, close-up, color image, completely bald, education, elderly, ethnic, european, front view, grow, growth, happiness, happy, head and shoulders, holding, indoors, laughing, learn, learning, lifestyles, looking at camera, man, mathematical symbol, mustache, one man only, one person, one senior man only, open collar, people, photography, portrait, professional occupation, professor, rolled up sleeves, rubberball, senior adult, skill, standing, teacher, vertical, vitality, wisdom, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, b03320