Youngest Entrepreneurs Running the World's Most Valuable Startups

Now let's look at some of the founders behind those companies that are taking the world by storm.
Some are incredibly young.
One 25-year-old has built an $800-million-dollar business.
And, by the way, say what you will about reality star Kim Kardashian, but don't forget: she also has $250 million startup.

16. Kevin Systrom and Mike Krieger

Ages: 27 and 25, respectively
Company founded: Instagram
What it is: Mobile photosharing app with 9 million users
Company Valuation: $100 million

15. Alexa von Tobel

Age: 27
Company founded: LearnVest
What it is: Financial tools and services for women
Company Valuation: $100 million

14. Jennifer Hyman and Jenny Fleiss

Ages: 31 and 28, respectively
Company cofounded: Rent The Runway
What it is: Rent The Runway allows users to rent dresses for a fraction of the cost of buying the dress outright.
Company Valuation: $105 million

12. Bryan Goldberg, David Finocchio, and David Nemetz

Ages: 28, 28, and 27, respectively*
Company cofounded: Bleacher Report
What it is: A sports blog made of paid, professional editors who oversee thousands of unpaid contributing writers. Founded in 2008, it has 20 million monthly unique visitors.
Company Valuation: $120 million
*Zander Freund, 28, (pictured) cofounded Bleacher Report too, but he is no longer with the company.

13. Dave Gilboa

Alex Bain

Age: 30
Company cofounded: Warby Parker
What it is: A prescription glasses online discount retailer.
Company Valuation: $120 million

11. Ben Lerer

Dan Frommer

Age: 29
Company founded: Thrillist
What it is: Digital lifestyle publication and daily deals for men; currently reaching over 2 million subscribers in 17 markets.
Company Valuation: $150 million

10. Kim Kardashian

AP

Age: 30
Company cofounded: Shoedazzle
What it is: Stylists pick and send users shoes, handbags and jewelry every month for $39.95.
Company Valuation: $280 million

9. Daniel Kafie and Josh Kushner

Ages: 28 and 26, respectively
Company cofounded: Vostu
What it is: Online gaming site
Company Valuation: $300 million

8. Aaron Levie

Age: 26
Company founded: Box.net
What it is: Online filing sharing platform
Company Valuation: $550 million

7. Naveen Selvadu

Age: 29
Company cofounded: Foursquare
What it is: Social location/check-in app and rewards platform
Company Valuation: $600 million

6. David Karp

Tumblr Founder, David Karp

Age: 25
Company founded: Tumblr
What it is: Social blogging platform
Company Valuation: $800 million

5. Daniel Ek

Spotify

Age: 28
Company founded: Spotify
What it is: Digital music service with access to millions of songs via a freemium/advertising model
Company Valuation: $1.1 billion

4. Brian Chesky, Joe Gebbia and Nathan Blecharczyk

Airbnb

Ages: 30, 30 and 28
Company cofounded: Airbnb
What it is: Short-term apartment rental platform
Company Valuation: $1.3 billion

3. Tim O'Shaughnessy and Eddie Frederick

Ages: 29 and 30, respectively
Company founded: LivingSocial
What it is: Daily deals site
Company Valuation: $3 billion

2. Arash Ferdowsi and Drew Houston

Ages: 25 and 28, respectively
Company cofounded: Dropbox
What it is: File sharing and storing platform in the cloud
Company Valuation: $4 billion

1. Mark Zuckerberg

AP

Age: 27
Company co founded: Facebook
What it is: Social network
Company Valuation: $80 billion