Greyyowl:
He can do nothing but play Matchplay, Alt Shot, Stroke, Blitz and CTTH for fun as he will be inelibigle to compete in Country Club competitions, all competitions are off limits for under 18's.
No tournaments or anything.
Only thing I found in the T's and C's, state you must be 18 and older to play for credits.
Pretty sure he can enter "no fee" tourney's...I don't know why WGT would not allow it?
Edit:
From the T's and C's:
In-Game Skill Based Competitions
As part of regular WGT game play, WGT may sponsor and give you the opportunity to earn WGT Credits in certain in-game skill based monthly and weekly competitions ("Competitions"). No purchase or payment is necessary to participate in such Competitions. The odds of earning WGT Credits in Competitions depend on the number of eligible participants in and their relative skill in the Competitions. Competitions are open to individuals who are 18 years of age or older or the age of majority in the entrant's state or province/territory of residence, whichever is greater.