[jmatta]

Anything beyond five years is suspect, as the rubber starts to dry rot and breakdown forming small cracks...worse thing happens is tread separation when put under stress. I'd inspect my tires thoroughly for any signs of cracking; is it worth the risk of damage to your car or injury due to old tires? I'd say you are borderline, but this is just my experience as a track junkie...I'm not a tire engineer.