So they are week 22 from 2015 so coming up for 6 years old, if they have been stored correctly will still be ok and for £49, just wear them out quick.
Full price tyres I would never expect them to be older than 2 years.
Frankh, I’d better get my gear on right now as this (below) is from the Avon web site......
The British Rubber Manufacturers Association advise tyres should be used within 6 years of manufacture. The tyre should then be removed after a total of 10 years. Avon recommend tyres should be used within 5 years of manufacture. The tyre should then be removed after a total of 7 years.
Just letting you know the score since I posted the eBay tyre info on here, ...I suppose that you pays yer money and takes yer choice!