Mine too. The concentrates last about three years before turning black (however see here) but if you mix them up they may very well last longer. APUG member hrst has done some tests on this. My experience is that 2 1/2 year old mixed up RA4 dev produced prints indistinguishable from fresh dev (to this amateur's eye). Mix the lot up and place it in 1 litre pop bottles with the air squeezed out. It's not a long term solution but it may give you a 2-3 year buffer.
yeah why IS that. I've always thought that working solutions would go belly up first, but I have a year old RA4 dev solution that actually works just fine where the concentrates I mixed it from have long since given up the ghost. Black part B, mixed up another litre, wouldn't put a dent on a test strip.
Anyhow, back on topic (sorta), why aren't the fuji hunt C-41 and E6 kits available in the US ? They're top-notch.