[DanEC]

It's painful. I have a 66 Vette with 25 year old BF Goodrich tires and a 67 GTX with 16 year old Coker redlines. They all look like new, low miles, no cracks, hold air fine - but I know they need to be replaced sooner rather than later. I figure most cars that spend 98% of the time in a garage out of sunlight are probably safe beyond the 7 yr rule for daily-driver tires - but for how much more time is a big question mark. There's no absolute answer except to replace them.