# At 65, Peggy Whitson became the oldest woman to orbit Earth when she commanded the privately funded Axiom Mission 4, leading a four-person crew from four nations to the International Space Station for 18 days and raising her career total beyond 695 days, the longest time in space accumulated by any American astronaut or any woman in history

> Axiom Space's official profile records a spaceflight career without equal among American astronauts or women. At age 65, Peggy Whitson commanded Axiom Mission 4 to the International Space Station. The flight made her the oldest woman to reach Earth orbit and increased...

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Byline: Axiom Space
Published: 2026-07-13T15:59:19+00:00
Categories: Space

![Astronaut conducting a spacewalk with Earth in the background, showcasing outer space exploration](https://www.argo.net/wp-content/uploads/2026/07/Peggy_Whitson_astronaut.jpg)

Axiom Space's [official profile](https://axiomspace.com/astronaut/peggy-whitson) records a spaceflight career without equal among American astronauts or women. At age 65, **Peggy Whitson** commanded Axiom Mission 4 to the International Space Station. The flight made her the oldest woman to reach Earth orbit and increased her cumulative time in space to 695 days, 7 hours and 4 minutes.

The mission launched from NASA's Kennedy Space Center in Florida on June 25, 2025. Whitson flew aboard the SpaceX Crew Dragon Grace with three first-time astronauts representing India, Poland and Hungary. They docked with the station the following day and remained aboard until July 14. Grace splashed down off California on July 15.

Those dates added another chapter to a career that began in a NASA laboratory. Whitson trained as a biochemist before becoming an astronaut. Across five flights and more than two decades, she conducted hundreds of experiments, commanded the space station twice and accumulated more than 60 hours outside it.

## The mission that extended two records

**Axiom Mission 4**, known as Ax-4, extended two records already held by Whitson. She remained the woman with the greatest cumulative time in space and the American astronaut with the highest career total. Her age at launch also made her the **oldest woman to orbit Earth**.

Whitson served as mission commander throughout the flight. That position carried responsibility for crew coordination and spacecraft procedures during launch, rendezvous, docking and return. SpaceX controlled Crew Dragon operations from the ground, while the trained crew could respond to emergencies and use onboard controls when required.

Ax-4 completed 320 orbits and traveled about 8.4 million miles. During their stay aboard the **International Space Station**, the astronauts worked through more than 60 research activities. The program covered biomedical science, materials, neuroscience, agriculture and space technology.

## Three nations return to human spaceflight

Three members of the Ax-4 crew carried the ambitions of national space programs returning to crewed flight after absences of more than four decades. India was represented by pilot **Shubhanshu Shukla**, an Indian Air Force test pilot. He became the first Indian astronaut to visit the International Space Station.

Poland's crew member was **Sławosz Uznański-Wiśniewski**, an ESA project astronaut and engineer. Hungary sent mechanical engineer **Tibor Kapu**. Both men also made their first journeys into space and became the first astronauts from their countries to work aboard the station.

India's previous crewed spaceflight had taken place in 1984, when Rakesh Sharma flew aboard a Soviet Soyuz spacecraft. Poland's Mirosław Hermaszewski reached orbit in 1978. Hungary followed in 1980 with the flight of Bertalan Farkas.

Ax-4 brought these national programs together inside a privately operated mission supported by government agencies and international partners. "We're carrying the hopes of millions who dare to look up and imagine what's possible," Whitson said before the mission.

## From Iowa biochemist to astronaut

Whitson grew up on a farm near Beaconsfield, Iowa, a community with only a small number of residents. She has traced her astronaut ambitions to the Apollo 11 Moon landing in July 1969. At nine years old, she watched Neil Armstrong and Buzz Aldrin walk on the lunar surface.

Science became her route toward that childhood goal. Whitson earned bachelor's degrees in biology and chemistry from Iowa Wesleyan College in 1981. She completed a doctorate in biochemistry at Rice University in 1985 and joined NASA's Johnson Space Center as a research associate the following year.

Her early NASA work focused on biochemistry and the management of scientific research. That experience gave her a close view of the experiments designed for astronauts and orbital laboratories. NASA selected her as an astronaut candidate in April 1996, when she was 36.

Whitson's scientific background remained central to her astronaut career. During her first long-duration mission, she became the first **NASA science officer** assigned to the space station. She worked on investigations spanning human biology, biotechnology, physical science and research in microgravity.

## Five missions across 23 years

Whitson first reached orbit in June 2002 aboard the Space Shuttle Endeavour. She joined Expedition 5 and spent about 184 days in space. The mission established the pattern that would define much of her career, with long stays devoted to station operations and scientific work.

Her second flight began in October 2007. As part of Expedition 16, she became the first woman to command the International Space Station. That mission lasted about 192 days and included several spacewalks to maintain and expand the growing orbital complex.

Nearly nine years passed before her third launch in November 2016. Whitson joined Expeditions 50, 51 and 52. Her stay lasted 289 days, which was then the longest single spaceflight completed by a woman. She was 57 when she returned to Earth in September 2017.

After retiring from NASA in 2018, Whitson flew twice for Axiom Space. She commanded Ax-2 in May 2023 and spent about nine days aboard the station. Ax-4 became her fifth orbital mission in 2025, extending the span between her first and most recent flights to 23 years.

## Commanding the space station twice

Leadership in orbit became one of Whitson's defining roles. She first assumed command of the station during Expedition 16. In 2017, she took command again during Expedition 51 and became the first woman to lead the orbital laboratory twice.

A station commander coordinates a crew living inside a complex research facility that circles Earth about once every 90 minutes. The job involves safety, daily operations, scientific priorities, maintenance and communication with control centers around the world. Commanders also prepare the crew for emergencies such as fire, loss of cabin pressure, or a possible collision with orbital debris.

Whitson also served as chief of NASA's Astronaut Office from 2009 to 2012. She was the first woman and the first person without a military background to hold the position. The office oversees astronaut training, assignments, development and support for human spaceflight missions.

Her later Axiom commands carried that experience into **commercial human spaceflight**. On Ax-2 and Ax-4, Whitson led crews that combined private mission management with NASA station requirements and SpaceX transportation systems.

## Ten spacewalks and 60 hours outside

Across her NASA missions, Whitson completed ten spacewalks totaling more than 60 hours. That remains the highest cumulative spacewalking time recorded by a woman. It also places her among the most experienced spacewalkers of any gender.

Working outside the station requires astronauts to operate within a pressurized suit while moving around a structure roughly the size of a football field. Every task must account for limited mobility, bulky gloves, changing sunlight and the constant motion of orbit. A dropped tool can drift away permanently.

Whitson's excursions supported construction, repairs and upgrades. Her work included installing station hardware and replacing components that had failed or reached the end of their operational lives. Some spacewalks lasted for more than six hours.

Years of preparation support every excursion. Astronauts rehearse underwater in NASA's Neutral Buoyancy Laboratory, where submerged station models reproduce some of the movement challenges found in weightlessness. They also train for equipment failures and medical problems that could arise outside the spacecraft.

## What 695 days in space means

**695 days in space** equals almost two cumulative years away from Earth's surface. Whitson accumulated that total across five missions between 2002 and 2025. Most of the time came from three long NASA expeditions, followed by two shorter commercial flights.

Long-duration missions reshape the human body. In microgravity, bones lose some of the mechanical loading produced by standing and walking. Muscles also receive less routine resistance. Astronauts counter these changes with carefully planned exercise that includes cycling, running and resistance training.

Fluid distribution changes as well. Blood and other fluids shift toward the upper body, which can contribute to facial swelling and changes inside the eye. The cardiovascular system adjusts to pumping blood without the familiar pull of gravity. Returning crews then readapt to balance, movement and normal gravitational loading.

Whitson's career total reflects repeated cycles of preparation, flight, recovery and renewed qualification. Each mission required medical evaluation and extensive training. Her return at age 65 demonstrated that experienced astronauts can remain operationally capable far beyond the ages associated with the earliest era of crewed spaceflight.

## The difference between orbital and suborbital records

**Orbital spaceflight** requires enough sideways speed for a spacecraft to keep falling around Earth. Vehicles in low Earth orbit travel at roughly 17,500 miles per hour. At that velocity, the curve of the spacecraft's fall follows the curve of the planet.

Whitson's age record applies specifically to women who reached orbit. Her Crew Dragon accelerated into orbit, approached the station and remained in space for weeks. She had previously held the same record after flying at age 57 in 2017.

Wally Funk holds the broader age record for a woman traveling to space. She was 82 when she flew aboard Blue Origin's New Shepard in July 2021. The suborbital vehicle crossed the commonly used boundary of space and returned after a short flight.

Suborbital missions follow an arc that gives passengers several minutes of weightlessness. Orbital missions continue around Earth and can support stays lasting days, months, or longer. The speed, energy, training demands and physiological exposure differ substantially between the two flight profiles.

## A NASA career continued through commercial spaceflight

Whitson retired from NASA in June 2018 after more than three decades with the agency. At that point, she already held the American record for cumulative time in space. Her move to **Axiom Space** opened a route back to orbit through the emerging private astronaut program.

Axiom appointed her to leadership roles in human spaceflight. She helped prepare private crews for missions that had to meet the operational and safety standards of NASA, international station partners and transportation providers. Her experience connected the station's government-led history with a growing commercial sector.

In May 2023, Whitson commanded Ax-2 and became the first woman to lead a private astronaut mission. Two years later, Ax-4 placed her in command of three spaceflight rookies. "For me, returning to space is always a privilege," she said before launch.

The composition of Ax-4 showed how access to orbit is changing. A private company organized the mission. SpaceX supplied the rocket and spacecraft. NASA supported the visit to the station, while India, Poland and Hungary backed their national astronauts.

Whitson's fifth mission joined those elements under the leadership of a biochemist who began working at Johnson Space Center in 1986. By splashdown on July 15, 2025, her record stood at 695 days, 7 hours and 4 minutes. It captured a career that has stretched from NASA's early space station expeditions into the expanding era of commercially organized human spaceflight.