[EnquiringMind]

How old is that thing? Haven’t 707s been around since the late 50s?

[Prophet in the wilderness]

http://www.boeing.com/commercial/707family/.

http://en.wikipedia.org/wiki/Boeing_707.

First commercial flight was on October 26, 1958.
The Dash 80 ( 367-80 prototype ) Udvar Hazy building at the Air& Space Museum in Virgina near Dulles Airport.
http://www.nasm.si.edu/museum/udvarhazy/artifacts_air.cfm#D

I think some people complained that the 707 make to much black smoke taking off so Boeing had to devise some way for the engines to burn cleaner so they found a way to inject water into the engines and it burned cleaner.