SBA study on business closure rates (as opposed to failure) provides some insights on business survival rates. In a 2003 study, the SBA found 50 % survived, 17% were successful but closed and 33% closed and unsuccessful after 4-5 years.
The study found 39.5% survived after 6 years.
Source:
Headd, Brian, “Redefining Business Success: Distinguishing Between Closure and Failure,” Small Business Economics, 21, 2003, pp. 51-61, reprinted by the Office of Advocacy, U.S. Small Business Administration, 2003.