I was 19 when I was diagnosed and did shots for 3 months before I got my first pump. It’s the best thing I ever did, and have been a pump user nonstop for almost 15 years. I’ve also used the Dexcom and highly recommend it. As far as pumps go, I’ve used the Omnipod and Minimed. I’m currently on the Minimed 670G, which I love, but it’s not for everyone. I’d suggest “walk before you run” with the Minimed 670G because it requires a little pump familiarity.
I’ve also had my fair share of I’ll advice from medical professionals. I’d suggest calling Minimed or Omnipod and speaking to one of their people to learn more. At the end of the day, it’s yours and your son’s decision, not the doctors!