He was 15 when he created Traf o Data, and was 20 when he had established Microsoft.

Traf-O-Data, a company he formed with Paul Allen that aimed to provide high-tech traffic counting solutions.

he and paul allen created the TRAF-O-DATA

Gates and Allen then formed a company that they called Traf-O-Data. They put together a small computer for measuring traffic flow and made about $20,000. The company remained in business until Gates and Allen graduated from high school.

Probably near the end of the time he was running Traf-o-Data in New Mexico.