Just keep the following in mind too:
Keep each object below 8,000 on the poly count, or the plugin will not export your Age, it will give you an error instead.
If you think/know that your Age is going to have performance issues due to a high poly count, consider using Visregions (softvolumes) to "hide" things that normally would not be visable to the player depending on where they are.
For example, I've been expanding serene, and I have 3 major visregions now set up. When you first link in, only the first area is visable to the player, so the 2nd outside area and the inside of the Inn are NOT rendered while you are in the first area. As you go down the secluded path, you exit the fist area, it no longer is drawn, but the 2nd outside area becomes visable (but the inside of the Inn is still not drawn either}. Once you get inside the Inn, both the outside regions are no longer rendered.
This helps performace of the Age dramatically. And it's not really that hard to do either. Of course this takes some planning too, you don't want thing to suddenly pop in and out of existance where the avatar can see that happening.
For how to use Visregions to do this, take a look here:
Visregions Unlocked