Keywords
40's, 40-45, 40-50, 40s, 45-50, 50-55, 50-60, 55-59 years, 55-60, accessory, adult, america, american, americas, authentic, authenticity, blackboard, calculus, caldwell, caucasian, chalk, chalk board, chalkboard, class, classroom, close up, close-up, closeup, color, color image, colour, confidence, confident, continuing education, copy space, educating, education, educator, equation, eye-glasses, eyeglasses, fellow, fifties, fifty, formula, forties, forty, gentleman, glasses, gray, gray hair, grey, grey hair, guy, hair, head & shoulders, head and shoulders, higher education, holding, horizontal, human, human being, id, idaho, indoor, indoors, information, inside, instructing, intelligence, knowledge, learning, looking at camera, male, man, math, mathematician, mature adult, mature men, mid life, mid-west, middle age, middle aged, middle-age, middle-aged, negative space, north america, occupation, one, one person, opportunity, people, person, photography, portrait, portraiture, posing, positive, pride, professor, proud, real people, school, schoolroom, self-assured, serious, seriousness, side view, solemn, somber, specs, spectacles, standing, teacher, teaching, tuition, u.s, u.s.a, united states, united states of america, us, usa, western european, white space, wisdom, work, working, writing, 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, bld176074