You don’t have to start early to become the richest man in the world. Mori was an economics professor until he left academia at age 55 to become a real estate investor in 1959.
Mori started his second career by investing in the Minato ward where he spent his childhood, and within a matter of years he was presiding over Japan’s real estate boom.
When Mori died in 1993, he was Forbes’ two-time reigning world’s richest man with a net worth of around $13 billion. He was something of a Japanese precursor to Warren Buffett, though. Mori never seemed totally comfortable with the fame and fortune his second career won him. He dressed traditionally, abstained from alcohol, and lived a fairly modest life.