One Tough Cookie.
Join Date: Feb 2005
Location: West Hartford, CT
Bikes: Too many and not ENOUGH!
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If the tires "look like new", they probably have not been harmed! (Ozone problems would occur if the car was run in the garage frequently, or the tires were stored near an electric motor.)
In fact, is your friend's garage usually cool, dark, and shady? If so, the tires may not have "aged" all that much--with proper storage conditions (like those I mentioned), tires can be stored for years without damage.
Unfortunately, most of us cannot store our tires in "ideal" conditions--and the tires pay for it!!