1) Have you ever bought a book that was made before you were born? (the physical book, not the text)
2) Which book on your shelves takes place in the oldest time period? (Victorian/Medieval, Stone Age?!)
3) Have you got a book that was originally published in same year that you were born?
4) Which book on your shelves have you had for the longest ?
5) Which book have you had the longest but never read?
6) What's the oldest book you own?
7) Which book do you have that was written the longest time ago?