When I bought my 85 Kawasaki ZN700 from a barn in WI, it had 1,053 miles on it and the original Bridgestone tires looked almost like new with no cracks or signs of age. I replaced them anyway with Metzler Lazer Tecs bought from Motorcycle Superstore. The rear was 5 yrs old when it arrived. I put in on anyway.
Hey, now it's ten yrs old!