"Traditionally, Jewish boys begin studying Gemara at age 10."

"He started to splutter that he didn't remember exactly which Daf it was on. 'There's no such Gemara!' I said. I really don't know if he was aware that he was entirely fabricating a Gemara or not. But I find it amazing that people are so entirely out of touch with what Chazal really said about this sort of thing, and with what Jews traditionally did, until just a few decades ago." (source)