That looks really old for sure. I also remember using the Castrol GTX oil in my old Hondas from the late 60's into the 70's when I was a kid. That is what the local Honda motorcycle dealer always sold and recommended.
thats not alot of dust on those bottles, but I would say at least a few years of dust accumulation from when the photo was taken.
This PQIA link has a bottle from 2010 that looks similar font and other attributes. Their marketing department needs to add a little pizazz. http://www.pqiamerica.com/warrenoilnov2010.htm
I don't think they're very old at all honestly - Coastal Farm and Ranch (Country store chain near me) sells Warren SAE30 as their store brand oil and the bottles look the same