Silver 04,
I am not going to go into the "Runflat" scare , as I personally think it was overblown, but regardless, a 10 year old performance tire with 18k is not one I would ever recommend to a friend who tracks his car. Not trying to be rude, but having tested tires in the past, and tracked cars for 33 years, I would sure suggest it is time to get a fresh set. Michelins are likely your best bet, and though I know some folks who don't like Nittos, they are a less expensive alternative. There are even some DOT track Toyos, that are not bad for the street , so options are out there, but definitely you are the one I would suggest should be viewing some new donuts, and the gentleman with the 08 is fine. Just my humble opinion and as noted by others, age is an issue with any tire, regardless of manufacturer.