young entrepreneurs' organization   (link)

http://www.yeo.org/
The Young Entrepreneurs' Organization (YEO) is a volunteer group of business professionals, all of whom are under 40 years of age and are the owners, founders, co-founders, or controlling shareholders of a company with annual sales of US$1 million or more. The World Entrepreneurs' Organization (WEO) is YEO's graduate organization, but is also open to new members who are over the age of 40. WEO members must meet similar criteria to that of a YEO member; however, applicants must join by their 46th birthday.

The YEO/WEO mission is to support, educate and encourage entrepreneurs to succeed in building companies and themselves.