Kids these days. It seems like they’re writing HTML before they learn how to talk. And a lot of them are starting companies before they graduate from high school.

Here’s a list of some of our favorite teen entrepreneurs. And please keep in mind that there are lots of startups we’ve yet to hear about. So if you are a young entrepreneur, make sure to leave a comment below and add your bio and startup information to CrunchBase.

Jessica Mah

Jessica Mah, 19, is currently the CEO and Co-Founder behind Indinero, a Mint.com for small businesses. Mah started her first startup at 13. Last year, shefounded internshipIN.com, a site to help high school and college kids find internships in their area. Now, at 19, Mah is finishing up her Computer Science degree from the University of California, Berkeley, as well as being the CEO of Indinero.

Ashley Qualls

Ashley Qualls, 19, started WhateverLife when she was 14, a site designed to give MySpace users free Myspace layouts and HTML tutorials. She employs both her mom, and her friends who do graphics for her. Qualls started WhateverLife in 2004 as a hobby, and now has turned into a business, with her site getting anywhere from 150,000 to 360,000 daily page views.

Donny Ouyang

Donny Ouyang, 17, started his first business in 2006 called Kinkarso Network. Kinkarso Network operates a number of web properties including; BattleForums.com, HostBright.net, ChristianAvenue.org, etc. Ouyang has been featured in Entrepreneur, PC Magazine, Retire At 21, Internet Entrepreneurs, and many other sites.

Sam Purtill

Sam Purtill is one of the founding engineerings of YouNoodle, a service that lets users follow start-ups that they are interested in and predict success of start-up teams based on analysis of historical data about qualities of the team’s founders and other information. Purtill originally built the site, and has been with the company since September 2007. Sam placed his previous project, ClassOwl, on hold to join YouNoodle, despite taking the idea to a product in less that six months. He also has worked on various design projects in Romania. Purtill is now attending Stanford University.

Grant Bell & Robert Day

Grant Bell is a teenage entrepreneur who is the co-founder ofTomorrow’s Web, an online network dedicated to supporting and engaging with young people with an internet in the web, technology and entrepreneurship. Bell is also the Founder ofPitchie, a stealth startup.

Robert Day is the co-founder of Tomorrow’s Web as well. Day has worked for various web companies such as ChannelFlip and Be Broadband’s OpenHub.

Mark Bao

Mark Bao, 17, is an internet entrepreneur based in Boston, MA. Bao is the founder of Avecora and Ramamia. In August 2009, Bao sold his product, Avecora OnDemand, to Branchr Advertising, and renamed the product Atomplan, which he is still the acting CEO of. In the past, Mark has been involved with the Facebook Platform, launching numerous applications, selling three applications, and organising the Facebook developer meetings in Boston, as well as the main event Facebook Developer Garage Boston.

Zachary Collins & Dustin Snider

Zachary Collins and Dustin Snider are the co-founders ofYazzem, a site which allows anyone to share their thoughts about anything that interests them by starting and joining topics. In July 2009, Collins sold Twtbase.com, a database of Twitter apps, and is also home to the very first Twitter applications search engine.

Patrick DeVivo

Patrick DeVivo is a blogger and entrepreneur in New York City. He founded Youth Bloggers Network in May 2007, and then sold the site to Teens in Tech Networks in March of 2009.

Of course, there are entrepreneurs that started their companies at a young age, and since then have grown their businesses. myYearbook co-founders Catherine Cook and Dave Cook started the company in 2005. Catherine is currently a student at Georgetown University, while also working on myYearbook’s growth and features. myYearbook is one of the largest teen oriented social networks, getting about 3 million unique page views per month according to Compete.

Disclosure: I am the Founder and CEO of Teens in Tech Networks. Teens in Tech Networksacquired Youth Bloggers Network in March 2009. Youth Bloggers Network was founded by Patrick DeVivo, who is mentioned above.