[mdross1]

A lot would depend on your comfort level with aging tires and the way you use the vehicle.
Our muscle cars have tires that are over 30yrs old,no weather cracking,or visiable age related issues,because of the way they are cared for.
They still make good smoke when the urge hits these cars are not used in any competition needing super adhesion.Despite what the naysayers decry there is nothing wrong with running outdated tires. Heck,a lot of people say you should never run a tire with a plug installed, another myth.