Tire age

[KellerMAC]

Here's one for you - in 1998 I put new rubber on my 72 C10 and shortly thereafter (less than 100 miles), I pulled the truck into the garage and started my rebuild. I left the stock wheels and new tires on the frame during the rebuild and then I swapped out the steelies for rally wheels. The tires look brand new and have no tread wear - however, when I went to have them mounted on the rally wheels at Discount Tire (where I bought them in 1998), the guy looked at the date on the tires and refused to mount them on the rally wheels. I ended up taking them to a local tire shop and they mounted them without issue. Here is my question, should I be concerned with these tires coming apart and go buy new rubber, or should they be fine until I wear them down a bit. I hate to replace them if there is no worries and I want to replace them if there is a concern of them coming apart on me at 60 mph on the highway.

It's always something, right?

Thanks,

KellerMac