K.K.
It is extremely painful. I would suggest consulting a urologist and also finding out if you insurance will cover it and or what the cost may be. The process is much more complicated than with a newborn.
Now my personal view, it is not worth it. My son had to be recircumsised at age 4, it was way worse than what we prepared for. The pain my son went through was bad. We had no choice, it needed to be done for medical reasons. So glad it is done and over with. If I had known what we would be going through I would have never had him circumised as a baby.
With your son being older it may not be as bad as he can be better prepared for the pain, as well as take much better meds for it. I would discourage it, but I would at least allow him to research it better. Boys can be very cruel, and his emotional health should be weighed as much as his physical health.