Today I got:

Congratulations. Your nation is one week old today. In celebration your citizens will experience +2 happiness today. Your population density of 33.40 population per mile is at a good level at this time. Your military of 1,000 (1,366) soldiers is considered adequate strength for the size of Lotholdtia. The infrastructure of Lotholdtia is adequate at the time with a level of 500.00.

So that made me think:

Has anyone ever done a list of different nation adjectives? Like for example..

You're a young nation at 7 days
You're an established nation at 101 days
You're an old nation at 191 days
You're an ancient nation at 847 days

etc etc..

There is a defined list in the code if you check the extended view, but no one really pays attention to it since it has no in-game effects.