So you're about to start your career as a DJ, or you're already a DJ, before it's too late, protect your ears.
Lets face it, as a DJ hearing is the most important tool in your arsenal, if you can't hear, you can't DJ.
Andrew Duffield (Club Ready DJ School) explains why it happens and how to prevent permanent hearing loss.
On the funny side, there's this.
https://www.imdb.com/title/tt0205177
There's a DJ who suffers from serious hearing loss played by Rhys Ifans. The film maybe a comedy, but it does tell a fable of the club DJ who didn't care, but he does now.