I started playing in my early 20's, self-taught for the most part. I've taken a few lessons over the years but nothing regular. I was fitted for clubs one time. It was indoors, on mats, using a simulator with very basic information. It ended up being a wasted investment. After two weeks of hitting worm-burners and fatties, I sold the fitted clubs for half of what I paid, went back to what I had, and have been an "off-the-shelf" guy ever since.
I'm sure that a proper fitting can make a tremendous difference for some players. But it just really never panned out that well for me, and quite frankly I've never regretted not becoming obsessed with spin rates and launch angles.
All of that said... nothing prepares a golfer for that one day that comes when he realizes that he can't deliver the club head speed like he used to, or that period in his golf life when he no longer has the luxury of going straight from the parking lot straight to the first tee. Nope, can't do that anymore. Too old and fat, I gotta get loose just so I don't hurt myself. I used to hit a PW 140 yards, easily. Now that's an 8-iron, provided it's a calm day.
Getting old is an absolute bitch.
Yet, at the same time, my best golf has occurred in my 40's. I can't honestly pinpoint why. Maybe part of it is knowing that I can't hit the ball like I used to, and to make up that difference - I've been forced to manage my game better, manage the course better. I'm sure that the advances in equipment and game-improvement technology has also helped soften the blow a bit.
The course one regularly plays also factors into the overall picture. I've been a private club member for the past decade or so, two different private clubs. And both of them have earned reputations as being two of the more difficult layouts in the area. My current club is undoubtedly the toughest course I've ever played, at least on a regular basis. The opening 9 is the shorter of the two 9's, but also much tighter. Lots of trouble lurking not far off the fairway. The back 9 is more open, but the greens are somewhat tougher and it's longer. After playing here for 3 seasons now, I can go to just about any other course in the area and play pretty well. For the most part, playing tougher courses has helped me establish a handicap that I can more easily play to when I'm playing elsewhere.
But I'm a lot different today than I was 20 years ago. I no longer get stressed out when I play crappy golf, although I still get frustrated like everyone else. Just not enough to cause me to invest 2 hours on a driving range to figure out what I'm doing wrong. That used to be me... I would shoot 75 and feel like I played horrible golf, like I had no other choice but to go bang 100 balls afterward and figure out how I could possibly hit the ball higher and straighter.
These days I'm more or less in a state of maintenance... I just take what I can get. I still practice, but it's casual practice. I'm not working on hitting certain shots or spending an inordinate amount of time working on a weakness. I might hit 30-40 balls, hit a few balls out of the sand, hit a few chips and pitches. That's about the extent of it. I'm just at a stage in my life where I'm pretty happy to maintain the level I'm at, without a huge time investment.
But I also realize that I can't expect to be consistently better if I don't invest more time. Everyone has to figure out what they're wanting out of their golf experience, and then figure out how to get there and maintain it.