You should be careful with advice you get on blogs from well meaning people who have no medical background, education, or expertise.
I was examined at the Mayo Clinic several times over 20 years ago. I have scoliosis; the curve was approx. 42 degrees when last checked (many years ago), today it is probably worse. I never had the surgery, and lead a full, normal life. The surgery is somewhat controversial. This surgery was first performed during the 70’s, so today there are patients who have been monitored over a period of many years, and in some cases it has been found that they developed complications and problems later in life. You can probably find the info on the web, make sure you are on reputable medical sites, not on blogs. There are several factors to consider with regard to the point where the surgery is necessary, the degree of curvature is not the only consideration. The position of the curve in the spine and other factors that a good orthopedist can point out to you while looking at Xrays of your son’s spine, are all looked at before making a final decision. I don’t know where you live but Dr. R. Moskowitz at the Joint Disease in NYC is an excellent Dr. Certainly I would agree with previous posters that a second and even third opinion are always advisable. Wishing you and your family much Hatzlacha!
EDITED