The story with the Vilna Gaon was, he told a talmid that after learning Sefer Yetzirah he started to make a Golem. But then he had a siman min Shamayim to stop. The Gaon said he understood it to be a message that he was too young to be doing this. The talmid asked the Gaon how old was he at the time. The Gaon answered, 10 years old.
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