tire age ????

I wouldn't drive them over 30 mph...going to a shop to have them replaced. On 5+ separate occasions, I've seen tires self grenade in the trunk and on the spare rack...one was at 14 years of age and the others were about ~19!!< iirc>. I once put some "rollers" on a car to load it on a trailer and next couple of days, two of 'em had popped minding their own business in my parking lot!