41 months; my son takes his interest in dinosaurs to another level. He can tell which ones are saurischians and ornithischians, carnivores, herbivores, omnivores, as well as theropods, and sauropods & the dinosaur sub-orders/families. The period dinosaurs each belong. He's also quite familiar with other prehistoric beasts such as the pterosaurs, plesiosaurs, & pelycosaurs. Interest stemmed from his 16 yr old 1st cousin handing him down a dinosaur book called "10 little dinosaurs" when he was 22 months old.
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