* Andreas K. wrote:
The median and quartiles are on page 7 of the report:
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Valid responses were received from respondents between 10 – 85 years. Overall, the average age of the Wikipedians that participated in the survey is 25.22 years. Half of the respondents are younger than 22 years. The most frequent age that can be observed within the respondents is 18 years. Splitting the respondents in four equally large age groups shows that 25% are younger than 18 years old, 25% are between 18 and 22, a further 25% are between 22 and 30 (e.g. half of the respondents are between 18 and 30 years) and the remaining 25% are between 30 and 85 years old. There is a slight age difference between readers and contributors - readers are, on average, 24.79 years old while contributors show an average age of 26.14 years. Finally, female respondents are younger (23.79 years) than male ones (25.69 years).
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You made a point about editorial judgement and age, so I looked at data on editor age. As far as I can tell, the above only mentions the average age of "contributors", it does not say "The median age of contributors is 30 years" or some such thing.