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2, 20-25, 20-30, 20's, 20s, 25-30, 40-45, 40-50, 40's, 40s, 45-50, 50-55, 50-60, 55-60, accuracy, addition, adult, associate, collaborating, colleague, color, colour, defending, fellow, female, fifties, fifty, forties, forty, gal, gentleman, glove, guy, health, health-care, human, human being, indoor, inside, lab, lady, low angle, male, mask, medical care, medical science, mid life, middle age, middle aged, middle-age, middle-aged, negative space, person, platter, r&d, research and development, rubber glove, safeguard, security, team, toiling, totaling, twenties, twenty, two, waist-up, wet, white space, women, work,