Therin of Andor wrote:
The thing that threw me was when Harry Morrow said
"Jim! The Enterprise is 20 Years old! We feel her day is over."
The script synopsis in Starlog's movie special says "40 years". The line was changed at the last minute.
Really? What a shame that was changed! Any idea why? I suppose they might have been worried that the broader audience would have been confused by it, whereas 20 years pretty much comfortably encompasses only what we got to see on screen in TOS and the previous movies.
One of the things which I always loved about Roddenberry's original pitch was that even in the sixties he always saw the Enterprise as having been a ship with an unseen history. He had never intended for it to be a 'new' starship even at the start.