I don't really feel that old, but:

I just realized I don't know what the word "library" even means to someone who has never had the physical/tactile experience of looking something up in a card catalog cabinet full of index cards bound on brass rods in serried ranks of deep wooden drawers. 

 Postulate: it is impossible to properly appreciate the internet if you have never looked something up in a really large collection of microfilm or microfiche.