The headline misquotes Bloomberg. He didn't say you *can't* teach a coal miner to code, he said you won't. And he's right. While it's certainly *possible* for some older adults to radically change their career paths into tech jobs, the majority of us lack the motivation and mental flexibility, and society doesn't want to spend the money to help us make the switch. It's just not going to happen. Bloomberg's overall point is dead on: we need to come up with ways to allow people to gently move into new careers that make the most of their talents, rather than just firing them, throwing a Javascript for Dummies book at them, and expecting them to become the next Zuckerberg.
That said, Bloomberg's got a pretty 19th century view of what coal mining is. Since it's all done with heavy machinery and robots these days, it's a pretty technically demanding job.