Ian Baker-Finch won 16 international titles and a major. He's just 48, but hasn't made a PGA Tour cut since 1994. His career as a golfer bottomed out just at a time (his mid-30s) when many players come into their primes.
What happened? His could be a cautionary tale for other players.
After his win at the 1991 Open Championship, he began to be paired with more long hitters. Naturally, he started trying to add length. He made swing changes that made him wild off the tee and actually cost him distance. He fought injuries and lost his confidence.
As Baker-Finch puts it: "I couldn't handle the pressure, and didn't like the fact I was playing poorly. So I said, 'Hey, why do I put myself through this? I'm going to go do something I enjoy.'"