Most have of us have been there, I can only share my experience but I’m 31 and have lived a happy life so far. My stutter is moderate but at times it can be severe. Speech therapy helped me to let go a lot of the stress and depression around stuttering. I am not a perfectly fluent speaker but even so I have made a good career as a first responder, I married a beautiful woman and made beautiful kids, and talk to ppl daily. There is no cure, but there is accepting it and not letting it keep you from a happy life. Working out is important, if he’s burned out find a routine to keep him active. I do 3x weight lifting days a week, sometimes I’ll throw a cardio day in there. Working out reduces stress and depression. Eating healthy and good sleep is important and just having family being there like you are. Lastly, I highly recommend watching the movie, “ The King’s Speech”. Based on the actual life of Queen Elizabeth’s father, King Charles. If the King of England can rule with a stutter, your son can accomplish anything. It’s not easy but this is our only life, spend it being happy and make it work for you.