Are you acting your age?
We live in a competitive culture. We're people who keep score. Try these three interactive tests to see how you compare to others in your aging cohort. This isn't science; for that, you need a trained clinician to give you a battery of cognitive and physiological tests. But if you're looking to keep tabs on how you measure up to others your age, have some fun with these. (See more below.)
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GRAPHIC: Kat Downs and Leslie Tamura / The Washington Post - Dec. 14, 2010.