Here are some key findings of the research:
Founders in their early 20s have the lowest likelihood of successful exit or creating a 1 in 1,000 top growth firm.
Across the 2.7 million founders in the U.S. between 2007-2014 who started companies that go on to hire at least one employee, the mean age for the entrepreneurs at founding is 41.9.
The mean founder age for the 1 in 1,000 highest growth new ventures is 45.0.
The most successful entrepreneurs in high technology sectors are of similar ages.
The “batting average” for creating 5 successful firms is rising dramatically with age. Conditional on starting a firm, a 50-year-old founder is 1.8 times more likely to achieve upper-tail growth than a 30-year-old founder.