Firstly, this is just a passing thought, not a strategy, I'm aware that novels should be written for specific markets.
Even so...
In my WIP I've created a pre-teen female character, who started out as a minor character but has become the heroine.
She has a pre-teen male friend who isn't a boyfriend, in the adult sense of the word.
It now occurs to me that because of these factors I could include it in the 'suitable for all ages' level on Kindle and other distributors.
However...
The story has another character, an adult female, who curses using the f-word.
But only three times, and only because she is stressed, because her life is in danger.
I wonder if this disqualifies the story from the 'suitable for all ages' category.
Oh, and I'm aware that pre-teens sometimes curse using the f-word.