COLUMBUS (WCMH) – Former Ohio Senator John Glenn has been admitted to The Ohio State University’s Wexner Medical Center.

A source close to the Glenn family confirms that Glenn, 95, has been hospitalized since late last week and that he is gravely ill. His family has been with him since that time.

John Glenn became the first American to orbit the earth in 1962. He also served four terms as a U.S. Senator.

In 1998, at 77-years-old, Glenn returned to space, becoming the oldest person ever to make that trip.

Hank Wilson with Ohio State University’s John Glenn College of Public Affairs said Wednesday that Glenn is at the James Cancer Hospital, but that doesn’t necessarily mean he has cancer.

Wilson said he didn’t have other information about Glenn’s condition, illness or prognosis.

Glenn apologized for his poor eyesight this year at the renaming of Columbus’ airport after him. He said then he’d lost some of his eyesight because of macular degeneration and a small stroke. Glenn had a heart valve replacement in 2014.

(The Associated Press contributed to this story)