Orthmann was awarded the Guinness World Record for longest career in the same company.
"Back in 1938, kids were expected to work to help support the family. As the oldest son of five, my mother took me to find a job at the age of 14," Orthmann told Guinness.
He started working for Industrias Renaux S.A. on Jan. 17, 1938, when he was 15 years old. His proficiency in German earned him a position as a shipping assistant, he said.
Orthmann was soon promoted to a position in sales, eventually rising to the position of sales manager.
The 100-year-old said he remains in good health and still drives himself to the office.
"I don't do much planning, nor care much about tomorrow. All I care about is that tomorrow will be another day in which I will wake up, get up, exercise and go to work; you need to get busy with the present, not the past or the future. Here and now is what counts. So, let's go to work," he said.