Lynda, I am 55 was diagnosed in June this year daughters of 14&17. If you read posts on hear (which is the only place a recommend you visit) you will see it is a very individual disease with people around 19 years+ others are less fortunate there are so many factors. You will need to understand exactly what stage he is at, for instance when I was first told I was going to be on immediate treatment to cancel my holiday in 2 months etc. etc. after it was investigated more with tests, I am very lucky to be smouldering with no treatment and leading a normal life at the moment, it could be months or years before I need treatment, when it does kick off there is varying treatments that then can give remission. I know exactly how you are feeling, your head will be all over the place, confused and anxious. The good thing, he is young so there are lots of options plus new drugs being tested all the time. Try and stay positive and find out as much as you can and ask questions of your specialist.
Good Luck you are not alone.
Main thing from others, is to stay positive