Is there any proof that Vegans and/or Raw Foodists live a lot longer than average?

My girlfriend is Vegan and believes its true. I mean she looks fantastic, and as long as I've known her she's never even had a cold...But is there really any indication that hard core Vegans and/or Raw Foodists will live greatly longer than an average person? Assuming they're very nutrient conscious and get all the right vitamins/minerals, etc...I was thinking of becoming Vegan myself...