Reptiles are cold-blooded, I wish I could be.
What are the life spans of Iguana's, there are so many different species.
Iguanas can live around 20 years in the wild; but as a pet I bet longer.
Are iguanas considered exotic pets? Are they allowed in city limits?
I guess exotic compared to cats, dogs, birds, etc.  They're allowed in my city, dunno anywhere else.
Are Iguana's affectionate, does yours know if they are being pet/loved? Do they portray emotions?
Well, mine doesn't bite...I don't think I'd know if it showed emotion, at least he let's me handle him.
I understand they are 100% herbivores. Are they inexpensive to feed?
It's pretty inexpensive, just veggies and I like veggies, too.
Do you keep your iguana in a pre-made cage, or do they roam freely?