Silicon Valley: no country for young men

Not really a convincing article. Trends can change without the sky falling. While the young do tend to take more risks they're also poorer as a group. Perhaps the run of billionaire founders was a fluke that won't often repeat. Many came out of tech, which is a maturing industry.

This is a really interesting article.

Perhaps the low hanging fruit is now gone. Perhaps it's going to be harder in future to establish really large companies.

Of course there are many valuable companies yet to be created, but perhaps an era is starting to come to a close.