For years after the dot-com boom, the 20-something upstart has been held up as a model of entrepreneurial spirit - take Google and Facebook, for instance. But contrary to such popular belief, it is the baby boomer generation - those 55- to 64-year-olds - that has the highest rate of entrepreneurship activity, according to a recent study by the Ewing Marion Kauffman Foundation, a Kansas City, Mo., nonprofit group that encourages entrepreneurship.
In fact, the study predicts the United States may be on the verge of an entrepreneurial boom because of a growing aging population. For the past decade, the 55-64 age group has been the most entrepreneurial. The youngest age bracket - 20 to 34 years old - has been the least active in creating new ventures, according to the study.

Post-World War II generation takes the lead in starting new businesses, study says.