Replacing tires based on age

[turboseize]

Yes, they will definitely be looked at very thouroughly, and the engineer might even write the tyre's age on the report as "Hinweis" (note or hint), but old tyres they do not automatically lead to an "erheblicher Mangel" (serious fault), not even "geringer Mangel" (minor fault).
Cracks in sidewall or tread, bulges in the sidewall, bald tread however would all lead to an "erheblicher Mangel", regardless of the tyre's age.

One or more "erheblicher Mangel" means you fail inspection and then have a 4 week window, during which you have to conduct the repairs and then present the car again for a follow-up inspection.

 

[Ammofirst]

I have a 1979 Honda cb-750. Purchased it 4 years ago and it had the original Michelin back tire. Took it in for a replacement and They charged an extra $40.00 bucks for the install. The thing was so stiff they had to cut it off the rim. Funny thing was it still held air just fine.

 

[jimbrewer]

Ford says six years. That sounds pretty reasonable to this desert dweller.

Besides, you have some control over it don't you? If you only put 5,000 miles a year on a car, why would you buy 60,000 mile tires anyway?