It is the logical step to look for retired academics, because they have the expertise needed. The demographics in the 15-35 range therefore are completely irrelevant for de-WP.
Ciao Henning
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Do you have any ideas how to get them? As I still believe, for many articles this is a meta issue, meaning that it is likely that only a few people in the world have necessary expertise AND a wish to edit the articles, and they all speak English, but may have random mothertongues (not necessarily German speakers).
Cheers Yaroslav