how old was the oldest astronaut when they first went into space and who were they?

Question: how old was the oldest astronaut when they first went into space and who were they?
- Keywords:
  astronaut,
  oldest,
  space
Asked by gracel to Lisa, Mark, Rachel, Sammie, Stephen, Tim on 5 Mar 2018.
- Stephen Wilkins answered on 5 Mar 2018:
  
  I think it was Dennis Tito, who was the first space tourist when he was 60.
  
  John Glenn was the oldest astronaut. He was the first American to orbit the Earth in 1962 but went back to space in 1998 on board the shuttle Discovery when he was 77!

Question: how old was the oldest astronaut when they first went into space and who were they?