I had some re760s that were about 3 years old. They did sit for about 9 months outside in GA through a winter season. They were very sketchy when I drove on them again. Some tires can apparently last up to about 7 years, but in my experience, I don't like tires that are any older than 2-3 years(less if you plan to track drive them). My Hoosier race tires felt like they had dried and hardened up after only a year