I just looked at the far right, and most are bad examples.

Charles Flint was already a success before founding IBM.

Amadeo Giannini was already a success (he actually retired at 31!) before founding the bank that would become Bank of America.

Kawasaki Shōzō was 39, not 56, when he started Kawasaki.

Ferdinand Porsche was indeed 56 when he founded Porsche.

Sheldon Adelson bought the sands when he was 54, but he'd already made millions of dollars in the entertainment business (running COMDEX, etc.).