[mikeleeorg]

I'd look much more at how founders saw failures than what their ages were.

Great point. A failure in itself is not as valuable as the lesson learned from that failure.

[einhverfr]

It's not just the lessons learned from it. It's how you conceptualize of failure and how you work your way through it to success. Sometimes failure doesn't happen because you make a mistake. Sometimes it is a natural phase on the way towards success.

When I am asked about starting a business, the first piece of advice I give is "your business will fail. It will run out of money. If you want it to succeed you have to be prepared to run it for a while after it has failed."