All my female villagers died. Does that mean that i have to start over. I have most of the puzzles completed so I would have to have to start over. However I am guessing I cant get the golden child with all male villagers. How do I make sure that my villagers dont keep dying so quickly. Is it just old age they died of?

You can click on their gravestones to see how old they were: any one over 60 probably died of old age, and there's nothing you can really do about that except research better Medicine tech.

Your game isn't completely toast yet, though! There are several random island events that give you children -- if you are lucky (and patient), you may get some girls that way. (Check out the forum for the story of Ponui)

You can start another game as another player and keep this one going, too.