I have a rough estimate that for the maths, physics, and chemistry Stack Exchange sites, it should be a bachelor's degree third year student or higher... maybe 22.

Arqade may have a lower value. 20, I guess.

What is it for all of the sites combined?

A just rough estimate, that is enough.

  • 2
    SE no longer stores age information, so there's no way to figure this out.
    – Tinkeringbell Mod
    Jan 11 at 9:14
  • 3
    insights.stackoverflow.com/survey/2021#section-demographics-age - but that's just a subset of Stack Overflow users.
    – Glorfindel Mod
    Jan 11 at 9:17
  • 1
    That's a valid question, however one you're not going to get any real answer for, sadly. Jan 11 at 9:22
  • 1
    @Glorfindel also, another footnote: only 82 percent of the answerers of that survey said they have an SO account. While this means they may have accounts/participation on other network sites, it's not unlikely the data there is skewed with people that aren't users as defined in this question (which says 'have an account and participates'). Even the ones that said they do have an account may have no participation otherwise.
    – Tinkeringbell Mod
    Jan 11 at 9:55
  • I believe the best you could do is to wait for survey's results and check the answers - it will not be precise (since there are people that does not answer) but it would be the best way to get any personal information's statistic. Jan 11 at 12:22
  • 4
    The average age of regular users is much higher than you seem to think, particularly if you consider those with some significant rep and not the do-my-homework crowd. Many of the regulars on physics and chemistry are working professionals, some are even in retirement.
    – Jon Custer
    Jan 11 at 14:05

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