When you think of an entrepreneur, you might immediately picture a kid from Stanford or some other top-notch tech school. But the fact is that the majority of the self-employed and entrepreneurial aren't young at all. As of 2010, only 2% of those under 25 were self-employed. Among those 65 and over, the rate of self-employment was 23%. And they're doing well: A survey by AARP found that 75% of older self-employed workers made a profit in 2011.
