Yeah, I watched it till the end and I saw that they actually mentioned it just before the 25:45 gem :)
The motto translates something like: Growing, but not getting older (or not aging as they say in the video). The idea is that it grows, develops but does not get old (in the quite negative connotation of this word).
Anyway, the video is quite naive and old-fashioned in a way but it is not much different from other similar videos on Discovery. And is informative. I learnt things I didn't know.