Europa Universalis 3: Heir to the throne demo
This is definitely the sort of game that will appeal to the 28-30+ age-bracket. It's the demo of the expansion pack to Europa Universalis III - a game I have so much trouble spelling that I'm afraid to actually play the thing. Anyway, it's a time limited version of what teh full expansion offers, with you playing as eight major European powers between 1492 and 1550. Chart territories! And similar! You can see more details over at Paradox's site - where you can also buy the thing. Hurrah for commerce! Hurray for trailers! Here's one now...
Hurrah!