I'm about to take a set to the shop to ask them if the 4 year old glue job they did is still good.
The tires still have lots of tread and hold air fine. I store them in my basement and use them for a handful of days each fall.

If it weren't for horror stories on the internet of rolled tires, I'd probably just keep riding them, but I suppose the glue will fail at some point? I don't want to find out the hard way.