1985 Bottle of Dom Perignon?

Question

My parents recieved a bottle of Dom Perignon when I was born to pass on to me when I am older. While moving my parents we stumbled across the bottle and they have since passed it on to me for my enjoyment. The bottle is dated 1985. Just out of curiousity, is the bottle still good to drink? It was stored with no light to get it, and is still in the box. Also, how much would you think this is worth? Thanks. Joe