A survey by the Founders Institute found that less ego and more experience correlate with success in entrepreneurship. Of course people will immediately assume that being older is a predictor of both of these qualities, but that incorrectly assumes causation (age ≠ experience). One can obtain an incredible amount of experience quickly by simply putting themselves out there, trying new things, and being open to experiences – learning from failures.
On another note, the term “less ego” oversimplifies the concept of ego. As Nietzsche and Heidegger first noted, what people meant by “ego” before the time of Nietzsche and Heidegger was actually “will.” (Ayn Rand still makes this mistake, in my opinion.) The ego is the self-identifying element of our consciousness, that through which we relate to the world. People with a “big ego” cannot think the existence of other egos (other people with thoughts and feelings) outside of their own. They can only see others as a reflection of their own ego. This essentially reduces the other to the same as or less than the self, which is ethically violent and, some philosophers would argue, the source of all hatred and war.
The will, on the other hand, drives people to assert themselves in the world. A strong will, I would say, correlates more with success than a big ego. True, a big ego and a strong will tend to go hand-in-hand, but they’re definitely not mutually dependent. Take Bill Campbell for example. Incredibly successful, yet you won’t find an ounce of pretension on him.
Conclusion: beware of the confusion between ego and will. Strive to have a strong will, while humbly manage your ego.
“[a wise person] acts without claiming the results as his; he achieves his merit and does not rest (arrogantly) in it: — he does not wish to display his superiority.”