Average time for startup to go from founding to exit is seven years. YC is the only one to have even been in existence for seven years. Not only that but even

Average time for startup to go from founding to exit is seven years. YC is the only one to have even been in existence for seven years. Not only that but even for YC non-exited companies are worth significantly more than the ones that have exited. Dropbox and Airbnb (both five years old) are individually likely to be worth more than the sum total of every YC exit made so far.