The yellow looks very 70's to me but I'm pretty sure they are older. There was also no makers mark on the cups anywhere so I don't know who made them. They really look pretty cool and would be great if you were to use them for an outdoor meal on some vintage patio furniture! I can see myself just sitting outside next to a vintage pool on a vintage pool chair with some green Astroturf on the ground around the pool drinking some delicious smoothies out of these cups! That would be great!
I really like the way this cup rack looks with the bent metal to hold on the cups individually. Now that is some style! They sure don't make them like they used to!