If you want real evidence that we’re in an era of technological upheaval, look no further than what’s happening to the S&P 500.

The index, which tracks the stocks of 500 large-cap US companies, is seeing an accelerating pace of turn-over. Large companies are being replaced by new entries at a pace never seen before.

In 1964, the typical S&P 500 company was in the list for 33 comfortable years. By 2016, this had reduced to 24 years. And it’s forecast to shrink to just 12 years by 2027.

So, at the current churn rate of 5.2%, about half of S&P 500 companies will be replaced over the next ten years.

The shrinking lifespan of big firms reflects what we’re seeing in the real world everyday: there’s an explosion of new, innovative companies using technology to rapidly disrupt incumbents.

What does this look like in practice? Well, jobs in solar are growing at 17X the rate of the US economy and are already more than double the number of coal jobs. How long before Exxon Mobil falls from the list, to be replaced by a solar or clean energy company perhaps? What a great time to launch a startup.

Read more on this here.