You could also skim the article on the page with the photos and look for any biographical information...
The Fundable team is made up of Louis Helm and John Pratt.
Louis, Fundable’s software architect, studied Computer Science Engineering at the University of Michigan. He is co-author of the Seventeen or Bust distributed computing project (seventeenorbust.com), which recently discovered the largest known non-mersenne prime number with the help of 5000+ users. He worked as a software engineer at Jabil Circuits before leaving to work on Fundable full-time.
John graduated in Political Science at the University of Michigan last December, where he worked for the university’s paper as a photographer. He also studied at the University of Havana, Cuba in 2003. John programs, designs and writes documentation for Fundable’s pages.
Based on what was written, I'd be surprised if both "founders" aren't 18.
edit: googled, and found some photos(Pratt looks to be ~26, while the coder guy does indeed appear to be ~16: http://emilychang.com/e/go/ehub/interview/fundable