Statistics
What the numbers actually are. Averages, spreads and age curves for the abilities these tests measure.
Updated 27 July 2026Average Reaction Time by AgeThe age curve, what drives it, and why the slope is gentler than folklore suggests.Updated 27 July 2026What Is a Good Digit Span?Percentiles for forward and backward span, and what a high score actually means.Updated 27 July 2026Average Typing SpeedWhere 40 words per minute actually sits, and what the number is worth.
How to use these figures
Every page here names where its numbers came from. Where a figure is drawn from published research rather than from our own visitors, the page says so in the same breath as the number.
You are welcome to cite any of it. All we ask is a link back to the page you took the figure from. That lets your reader check the source for themselves.
None of these numbers is a threshold. A distribution tells you where a score sits among other people. It does not tell you whether that score is a problem, and no page here will pretend otherwise.