I had a whole library of kids books before I even had kids (I am a teacher and it is a great excuse to by books ) I dont think kids are ever too young or too old to have books, and I dont think that any household can have too many- especially when your toddler becomes obsessed with the same one and you have to read it 10 times a day until it gets 'lost', it is nice to have a wide choice of distractions!