Oldest American astronaut to spent longest time in space is Jeff Williams
Q. Who will become the oldest astronaut to spent the longest time in space?- Published on 21 Mar 16a. Scott Kelly
b. Mark Kelly
c. Jeff Williams
d. None of the above
ANSWER: Jeff Williams
58 year old Williams is the first American to make a 3 hour long duration flight to orbit and will break the US record set by Scott Kelly. Towards the close of the mission at the International Space Station, Williams will be the American with the most cumulative days in space- 534.