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       xkcd - A Webcomic - Cohort and Age Effects (2080)
        
       Image:
       cohort_and_age_effects.png
        
       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 getting so (many/few)
       joint replacements?' depending on which trend fits your current
       argument better.
        
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