You probably know the startup founders stereotype — 20-something Stanford drop-outs wearing hoodies in Silicon Valley garages.

But the reality is the average startup founders are in their 40s.

"The ones with successful exits have actual trended a little bit higher in their average age," said Tom Spengler, Chief Revenue Officer at Coplex, a top-10 startup accelerator that works with Arizona-based tech ventures. He talked about the big ideas behind Coplex at Startup Coffee in Tucson.

Coplex bets on industry experts as the next great tech startup founders — someone who has an idea in an industry they know very well, and who has experience running a business.

"We think this founder is going to be the next great founder for the next 10-20 years in tech," said Spengler, who was a tech entrepreneur himself.

The idea behind Coplex is to help the industry expert/founder to design and build a tech company and figure out a tech business model. The Coplex staff strives to get their companies to revenue in 90 days.

About 70 percent of the Coplex companies are based in Phoenix.

Resources to learn more:

Greg's List, a list of Arizona-based software startups and companies