Weimaraner lifespan

Hi there,
maybe I'm getting paranoid as I grow older myself, but I guess I'm looking for crumbs of comfort from Weimaraner owners out there wherever you are. My two Weims (brother and sister) will be 13yrs old in February 2008 and that apparently converts to 91yrs old in equivalent human years. I try not to think too much about it as they are both doing quite well health wise at the moment with the aid of supplements. But I do kinda worry about how much longer I will have them as the breed average age is apparently 10 - 12yrs. I'd like to know if there are any healthy Weims out there around 15yrs old?
If you are interested in this topic please visit my site at http://www.weimaranerlife.com/
regards
David