Just based on my own opinion and stories I have read on here, as I'm sure you have too, of tires separating tread from carcass while driving even with no obvious signs of wear, etc. I would say replace them. I just replaced last month the tires on my '78 Z28 which were 16 years old with only 19,000 miles on them and no signs of cracking, etc. It is garaged all the time so the tires don't get exposed to a lot of UV rays. I just didn't want to take the chance with 16 year old tires. The guy at the tire store who I know well said that with the way I keep my cars garaged, other of course than when driving them, he would recommend replacing the tires every 10 years.
Hope this helps as I know it is a hard decision as to when to replace tires.
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