Do tires age sitting around in an attached garage?

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In 2014 a buddy of mine bought a 1984 Class A motorhome with 28,000 original miles on it and original tires. He changed tires in 2015 at a recommendation of a shop because they said rubber started to rot. So, figure tires can last 30 years while outdoors.

However, I once installed a set of old tires back in the 90's on my 87 Camaro and even though thread was well over the minimum required they would skid really bad in the rain. Turned out rubber had hardened with years and didn't provide good friction with the road surface.
 
Tyres have a shelf life as other members have mentioned.

Once fitted and pressurised, the aging can speed up depending on UV exposure, temperature ad humidity.

Also important is flat spotting/ deforming the tyre once they are fitted. I stored my car for 18 month stretch and even though I over inflated the tyres, I started getting wheel imbalance wobble. They balanced ok and looked fine to the naked eyes but in the end I changed them.

Having said my spare tyre which is slightly used and 8 years old is in tip top condition as it is not exposed to high heat and sun
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