DISCLAIMER: health risks could exist when vaping expired juice, but only because I don't know if they exist in the first place. So please take what I say with a grain of salt.
In my experience expired juices simply don't taste that good. I had a bottle of "kringle's curse" from Halo that was expired and when I gave it a vape it tasted nothing like it had when I received it and was completely unpleasant. I have also noticed that some of my really old juice tends to turn very dark in color and when this happens the flavor drops off.
In my opinion, if you want to vape it then go ahead but don't allow that vape experience to set the standard for that company's juice or that flavor.