There are many type 1 diabetics who have been able to live very long lives with their diabetes, without having any serious complications. To have this happen for your son it is necessary for him to take very good care of himself. He may not take his diabetes that seriously now, but if he does so in the near future he should be OK. I have been type 1 for 66 years, and I am very healthy. I have always done the best I could to have good control. I hope your son will learn all he can about his diabetes and improve his control soon.
Richard