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If the main point is to filter out recruiters, then 100 or 2 years should be fine. There's no need to filter out less active posters.

For a brief moment there I thought you were suggesting that it should only be available to people who registered 100 or 2 years ago

Same as the downvoting threshold (500).

I think anything from 200 to 500 would work well. Anything at or over 1000 is problematic since to get that you need to be quite active on the site.

500+; the downvoting threshold should be enough.