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CC	Cohort and Age Effects [Cueball as a news anchor is sitting at a desk with hands folded in front of him on the table. To the left is a presentation which includes a table with a header above the two by two table. Each of the two rows and columns are labeled.] Cueball: Tonight: Are Millenials killing the joint replacement industry? Operation rate per 100,000 Knee Hip Baby Boomers 720 390 Millenials 1 3 [Caption below the panel:] Stats Pet Peeve: People mixing up cohort effects and age effects. Younger people get very few joint replacements, yet they're also getting more than older people did at the same age. This means you can choose between 'Why are millennials are getting so (many/few) joint replacements?' depending which trend fits your current argument better.