Oh Fox, I strongly urge you to start reading book #1. IT IS SO GOOD. I would say that my kids were in 4th and 6th grades when we got the first book in paperback, and by the time we finished reading it, book 2 had been out awhile, and by the time we finished that one, book 3 was out.
We continued reading them until my daughter was about 14 (and my 16 year old son would wander over into the doorway, acting nonchalant but listening!). Because of the Harry Potter books, we read as a family far longer than I probably would have. In between books we tackled classic older kids books like A Tree Grows In Brooklyn and To Kill A Mockingbird. It's one of the things that makes me thankful to J. K. Rowling, for giving us years of extra family reading time.
And: the books are great. Enthralling. Exponentially better than the movies. Just try the first one, and if he's not into it after that, just the first book provides enough detail that Diagon Alley and Hogwarts are much more enjoyable.
If you want to read past that, but are not fully committed to tackling all 7, then books 1-4 are probably the lightest and most fun. Books 5-7 continue to grow more full of dread, although there are fun parts too.
I hope your son loves the Sorcerer's Stone!!!
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