It would be as stupid to base an investment strategy purely on a young age (as your text is implying). Good luck or good bye to your retirement funds this way..

I'd say identifying an underlying trend early (all examples you gave) and then picking the most promising candidate from companies building on that trend, is the key.

But still, there's also management quality, founders that grow as management personalities together with the business, and sheer luck.. point being, uber-successful investing is more an art than science. And surely, not just a young age..