At least your grandpa knows what a CD is. My grandpa is dead. 
I'm sorry.

My other grandpa is dead too. Both of my dad's parents are. They'd both be in their 80s now if they were still alive, I believe. [My dad is number 8 out of 10 kids, so they were always kinda old, you know?]
My pop, the one about with the CD burning question, has been dead 3 times though and they just keep bringing him back heh. He's also only 65, and Gram just turned 61, so it's not like they're too old to be familiar with CDs or anything.