In April 1959, NASA announced the first seven astronauts. The Mercury Seven are, in order of birth date:
John Glenn (1921)
Wally Schirra (1923)
Alan Shepard (1923)
Deke Slayton (1924)
Scott Carpenter (1925)
Gus Grissom (1926)
Gordon Cooper (1927)
John Glenn, the oldest of the Project Mercury astronauts and the first American to orbit the Earth, was the last to die, in 2016, at the age of 95.
Gus Grissom (1967) – Apollo 1 launch pad fire
Deke Slayton (1993) – brain tumor
Alan Shepard (1998) – leukemia
Gordon Cooper (2004) – Parkinson’s disease; heart failure
Wally Schirra (2007) – abdominal cancer; heart attack
Scott Carpenter (2013) – complications following a stroke
John Glenn (2016) – complications after heart valve replacement, stroke
Walter Cronkite (1916-2009) and Wally Schirra (1923-2007) covered the Apollo moon missions on CBS—far better than anyone else—and I can still remember the events as if they happened only recently.
Want to know who holds the title for longest duration human spaceflight (so far)? Valeri Polyakov (1942-) entered space aboard Soyuz TM-18 on January 8, 1994 and stayed aboard the Mir space station until returning to Earth aboard Soyuz TM-20 on March 22, 1995. That’s nearly 438 days (1.2 years) in space! Moreover, Polyakov, who is a medical doctor, spent over 240 days in space during his first visit to Mir in 1988-1989, giving a total spaceflight time of nearly 1.9 years.
While Polyakov still holds the record for the single longest duration spaceflight, Gennady Padalka (1958-) has spent more time in space than anyone else: 878.5 days (2.4 years)!