Board Thread:General Discussion/@comment-26392556-20150321102507/@comment-1894786-20150329020844

Noneofyourbusiness wrote: If gods age, it would explain Old Ursula being dead and gone. I said they age, I didn't say they died. Gods can let their aging process run its course (reverting back to a youthful appearance when they would "die") or remain fixed at one particular age, both by choice.

The only way for a god to die is to be killed. Ursula herself seems to be of the Greek variety, due to her relationship with Poseidon and the other Ursula, and the Greek gods could be killed but would never die of natural causes/illnesses.

And we've yet to hear of any enemies aside from Regina.