Keywords
70-75 years, beard, blackboard, caucasian ethnicity, close-up, color image, completely bald, elderly, ethnic, european, experiment, expertise, eyeglasses, front view, happiness, happy, healthcare and medicine, holding, indoors, lab coat, looking at camera, man, mustache, one man only, one person, one senior man only, people, photography, portrait, rubberball, science, scientist, senior adult, smiling, standing, vertical, waist-up, 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, b03315