The guy who maintains Helm, an important package in Emacs, is a 57-year old alpine mountain guide who learned to program when he was 42, as a hobby. https://sachachua.com/blog/2018/09/interview-with-thierry-volpiatto/
@peregrine Sadly he seems to have just stepped down from maintaining it - https://github.com/emacs-helm/helm/issues/2386 - but what an epic contribution!
That is pretty incredible.
Emacs seems like it has so many deeply interesting people involved with it.
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