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I don't think that's unusual. I'm certain we were using log tables at 12 or 13: I'm sure we started in Year 2 of secondary school (it might even have been year 1). Our log table books were well used by the time we sat our O Levels - not just for logs but for trigonometric tables too

Thank you for recommendation: I've never heard of Trachtenberg but he sounds like someone who's worth checking out

The point about Graham's number is not that it's the largest possible number (it clearly isn't) but it's the largest number that has figured in a mathematical proof Ronald Graham is an interesting bloke: he didn't only just come up with his number, he's also a juggler and invented the concept...