These few snippets are from my slide deck. (Post occasioned by tweetstream on the topic, 06.23-24.14.):
USA 1996-2007, Entrepreneurial Activity (firms founded):
Highest rate: Ages 55-64
Lowest rate: Ages 20-34
(Source: Dane Stangler, Kauffman Foundation, reported in the Economist.)
"The average age of a start-up founder is 40. And high-growth start-ups are nearly twice as likely to be launched by people over 55 as by people 20-34."
(Source: Vivek Wadhwa, Kauffman foundation, reported in Time/0325.13.)
Forrester Research: "[Age 55-plus] are more active in online finance, shopping, and entertainment than those under 55." (Sorry, no date available.)