Just look at 1996 on both the PGA and LPGA tours. The youngest winner of any of the four men's majors was 35. That was Mark Brooks in the PGA Championship. Of all the men's and women's majors, only one went to a golfer younger than 32. A modern age record was established in the men's majors, with an average winning age of 36.75.
Golf is truly the game of a lifetime.
Barring injury, it can be played skillfully for decades. Lew Oehmig, who won three U.S. Senior Amateur titles and also was runner-up three times, is my hero. His last championship came in 1985 when he was 69, and he remains the oldest U.S. Golf Association champion. Couples, sadly, is bedeviled by a bad back and may face an abridged career. By the way, I don't really know if there is a Fred Couples Fan Club.