I Made My First Million at 13. Here’s My No. 1 Rule for Investing

Becoming a millionaire by 30 is a rare enough achievement, but Michael Cammarata did it when he was in his early teens.

The cofounder and CEO of Schmidt’s Naturals, which makes natural deodorant and other household products, brought in over a million dollars when he was 13 by running a web hosting company. Cammarata, now 32, was an avid player of the video game StarCraft, around the turn of the millennium.

“I got into computers.