Should the Twilight characters be teenagers or adults?

I have the Sims2 and am making Forks. =) I don't know whether or not to start off the Cullens (excluding Carlisle and Esme), Jacob and his pack (excluding Sam), and Angela, Mike, etc. as teenagers or adults. If I start them off as teenagers there are a lot of outfits, hair, etc I can not use and they will look like they are 15 or something. Also it will take a while for them to grow up. However it will be easier to have parent/child relationships without the families making out with each other or something. They are also 15 (Jacob), 17 (Bella, Edward, and Alice), and 18 (Rosalie, Jasper, and Emmett) when the books start off. However if I started them off as adults there would be no school which they do go to. There would be no way to tell that Charlie was the father of Bella. They can only be spouses or roomates, and I'd have less time with them. So... what should I do?