It isn't 'normal' for a 1st grader to read at 5th grade level and the fact that he shows signs of boredom and his comment about it all lead me to the gifted side. The best thing I could offer is look up Deborah Ruf's book "Losing Our Minds". It is a great starting point for if your son is gifted and what signs to look for or look back on from infancy to get an idea of what level he would be at. Does he find math easy? Is he advanced in math?
Also talk to your school about testing him. Does your school have a gifted program in the early years? Some do not start until 3rd grade while others start in Kindergarten. You can ask the school to test him or you can pay privately to test. But testing will give you an idea of how gifted and if you might need to accelerate him through subject or whole grades. There are many avenues you could take but understanding where he fits on the gifted scale does help.
