If you are referring to a specific document, social media post, or technical report where this phrase appears, providing more context about the source would help in delivering a precise explanation.
: It might be a phrase unique to a specific forum, hobbyist group, or internal report that hasn't gained broad public recognition. crazy mature thumbs
The phrase does not appear to be a recognized idiomatic expression, viral trend, or technical term based on current data. If you are referring to a specific document,
: It may be a specific observation regarding "thumb-stopping" content (highly engaging posts) created by or featuring older individuals. social media post