I’ve got a unicorn in the shop (pics later maybe) with 8 year old tires. But they still have 10/32” tread remaining. This resulted in me learning that a scary amount of people haven’t heard of tire ageing. At the very least, inspect and consider replacement at 6 years. NTSB link for funsies.

Tire Aging and Service Life - NTSB

PDFhttps://www.ntsb.gov › news › Documents

If the link doesn’t work, try this one, or search “NTSB tire age”, should be first or one of the first:

https://www.google.com/search?q=ntsb+tire+age&oq=ntsb&aqs=chrome.1.69i57j35i39j5j69i60j0.3713j0j7&client=ms-android-verizon&sourceid=chrome-mobile&ie=UTF-8