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If what you are saying is true, it follows that the textbook we use is not in good natural English.
(b) is perfectly fine.
My mom lost her hearing in her mid-80s.
She lost her hearing in her mid-teens.
All sounds fine and native English.
In Japan, all the schools have to use textbooks that the Ministry of Education approves. And some (many?) of them are not written by native speakers. We should use ones that well-educated native speakers write.
Does (c) have a little different meaning from (b)