Stephen King wrote carrie at 26 when he was an english teacher at a high school.
Charles Bukowski didn't quit his job at the post office until he was paid $100 by an editor to become a full time writer.
Both these men have written great books, when they were working a job.
They were passionate enought to put in the work after the job.
Don't box people with a job. They can be creatives, inventors, and above all passionate too.