I would not worry too much about the reversals at this age. If he's still doing it in two years, I would be more concerned then. Rainbow Resource has a book called Correcting Reversals that has helped our DS1.
You can show him the "correct" order and direction for strokes for letters. I use the "modern printing" ebook from Teacher Created resources. It's only $5 and you download it and print what you need. It has a sheet that shows the order and direction of strokes for each letter, and practice sheets for letters and words. I did not want to spend a ton of money on a formal handwriting program. This gives me everything I need.
You can show him the "correct" order and direction for strokes for letters. I use the "modern printing" ebook from Teacher Created resources. It's only $5 and you download it and print what you need. It has a sheet that shows the order and direction of strokes for each letter, and practice sheets for letters and words. I did not want to spend a ton of money on a formal handwriting program. This gives me everything I need.






Sure, if a 17yo is still writing like that, it could be problematic. My boy couldn't care less what the alphabet was at 5yo, he just paid attention when we were reading the ABC board book. So writing things? Wasn't on his to-do list. He still has a backwards lower-case "e" and a few other goofy letters. But. He's still at the beginning! He's still learning! He gets so, so, so frustrated when he can't get things perfect the first time around (gee, wonder where he got that from?
). I have to constantly remind him that it takes time and lots and lots of practice to get really good at something. Handwriting included. 



i didn't have problems as a child, but i guess i've just outgrown it and have a hard time getting it back.

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