Old New Tires, Bad Idea?

[78F350]

I was browsing thru a salvage store today that had bought out the stock from an auto parts store. There were plenty of good, brand new tires that have been warehoused. The ones that I considered buying had a mid 2014 build date, they looked and felt fresh, but I passed since they are almost 5 years old already.
Should I reconsider? I have read internet wisdom that says yes and no. What does the 986 Forum say? These are purely for street use, no track.