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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, defending, device, discussion, fellow, female, fifties, fifty, forties, forty, gal, gentleman, glove, guy, head & shoulders, human, human being, indoor, inside, lab, lady, magnifier, male, mid life, middle age, middle aged, middle-age, middle-aged, person, r&d, research and development, rubber glove, safeguard, security, smile, speaking, talking, team, thirties, thirty, three, together, toiling, waist-up, western european, wet, white coat, women, work,