For some, it's mostly linear. Others encounter more twists, turns, and bumps along the way.
Donald Trump, for example, was born into a real estate development family, and he inherited his father's business at 25, according to Bio.
Kat Cole, on the other hand, became Cinnabon's president after quickly working her way up from Hooters hostess and waitress to the company's vice president by the time she was 26, Fortune reports.
To prove that no two paths to success are alike, we've highlighted what Trump, Cole, and 19 other successful people were doing at age 25.
This is an update of a post originally written by Vivian Giang and Max Nisen.