Old-Timey

In a third-grade class today I mentioned gameboys. One of my students came up to me afterwards and said, "Just one question, what is a gameboy?"
"Oh!" I said, genuinely surprised that gaming technology from my adolescence is now unheard of. "You know, like a hand-held video game."
Another student added, "Like a DS."
"Yes," I said, "Like a Nintendo DS."
She said, "Okay, good. This book I'm reading also talks about gameboys. It is kind of an old-timey book. I'm glad I know what they are now."