I don't know if you have The Titan's expansion or not, but you can only "auto create" (most will use the word auto queue, or AQ for short) villagers or any other unit in AoM:TT. If you do have TT, there should be a green loop arrow right by the villager's production queue (where it shows the icon/percentage) after you click the Town Center. Click it, and it will repeat whatever is in the queue so long as you have the resources and the population room.
Just be warned, though, that if you click two or more villagers and then the AQ button, you'll always be cheating yourself off 50 food. Also, if you want to AQ at, say, the barracks, you can AQ two hoplites and one hypaspist to loop a 2:1 production ratio for your units.
If you don't have TT, auto queue isn't an option, m'afraid.
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