Mae Jemison was 35 years old when she flew into space in 1992, and she is widely described as being 36 at the time of the mission because she reached that age during that year’s timeframe for her historic work as an astronaut.

She was born on October 17, 1956, and her Space Shuttle Endeavour flight (STS-47) took place from September 12–20, 1992, making her 35 during the actual flight dates.