I volunteer weekly in my kids' classes. I saw quite a few kids even in second grade reversing letters, 6 for a 9, etc. I see very few now in third grade. I think it still can be "normal" up to age 8 or so. If your child is in kindergarten, maybe it will settle out. Piano is a good idea for fine motor control, as could be taking drawing lessons, etc.
We have my son (who doesn't have dysgraphia) do the first two books of Handwriting Without Tears, a page a day, and his handwriting looks much, much better.
