This assertion has little to no scientific or mathematical basis.

Here's how you too can make up a sensational headline: 1) Start with an assumption 2) collect data points that prove your assertion -- leave those that don't out of the calculation.

There is no 'right' age to start a company. No age is too old.

-KFC was started by Col. Sanders when he was 50 something.

-John Warnock co-founded Adobe when he was 42.

There are many more examples, but those are only a couple off the top of my head.

EDIT: The comments in the valleywag piece contain a few more examples like Jim Clark.