As i stated in the other thread you made, I don't recall the exact time you begin to have multiplayer but it is very near the beginning. Somewhere in the bronze or stone age. I am currently in the Iron age and that is when you get to pick your nation but i have had multiplayer for a while now. Once you have access to multiplayer you will notice it immediately. Dont worry just attack and upgrade and you will be able to play multiplayer very soon.