I have to agree with the numerous comments, results of this &quot;test&quot; are way too dependent on hardware, platform, and other local variables.  Was kind of fun though.<p>Using the keyboard, my reaction time &quot;age&quot; was in low 20&#x27;s, <i>much</i> younger than my real vintage.  Using mouse clicks, well now I&#x27;m 44 or so.  My, how quickly one ages.<p>There is a serious side to such testing.  Used under tightly controlled conditions similar tests have shown interesting results.  For example, a number of studies report small but significant reaction time differences between kids with ADHD vs. without the disorder, though what that means is uncertain.<p>I&#x27;ve often thought a properly calibrated RT test of auto drivers would be useful.  Readily observed that when the stop light goes from red to green, many drivers are quite slow on the uptake.  Logically I wonder if a similar finding re: emergency braking might apply.<p>Hard to say how much RT differences are genetic vs. learned trait. In any case effects on traffic flow, or performance in critical situations probably have real-world meaning.