Observe.
You should carefully pay attention on how is he reacting to the baldness.
Don't bring the topic of "Hairloss" in between you for few duration.
Check on his Internet viewing habbits.
Check whether he is influenced by negative people who try to say "Hairloss" is end,"my life is destroyed because of hairloss" thing.
Many people have habbit of taking other's problem personally complicating their own life for no big reason.
And then most important:
Listen to his complaint without teaching him on how to deal with it.
Find out his complaints while facing hairloss.
and then help him on how to face this.
Hair Transplant can help.
To successfully deal with Hairloss can take years/decades,so don't hurry to find a solution within small frame of time.
For fun purpose,ask him to shave for small Photo session and find out how is he able to handle this thing.Next summer might be the best time for this.