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3, 30-35, 30-40, 30's, 30s, 35-40, 40-45, 40-50, 40's, 40s, 45-50, 50-55, 50-60, 55-60, adult, associate, collaborating, colleague, color, colour, communicating, computer, connecting, connexion, displaying, e-book, e-reader, electronic book, electronic reader, examining, exhibiting, eyeing, fellow, female, fifties, fifty, forties, forty, gal, gentleman, guy, human, human being, indoor, inside, joining, lab, lady, looking, male, mid life, middle age, middle aged, middle-age, middle-aged, observing, operating, pc, person, personal computer, portable computer, r&d, reader, research and development, seeing, spectating, spectator, tablet, tablet computer, team, thirties, thirty, three, together, toiling, typist, waist-up, western european, white coat, wireless, women, work, world wide web,