Several years ago I was told by an orthopedic surgeon who happens to play a lot of golf (I know - they all do) that it results from trying to "muscle the ball". He suggested to focus on more relaxed muscles during a swing and more stretching for warm up. I now spend a lot of time at the gym working on "father time" and do a bunch of stretching and rotational exercises related to golf twice a week. It works.
Now, if I could just find an exercise that can help me hit the sweet spot more consistently!

I had the same problem. My pro told me that I was making contact with the ground with my trail arm bent. I started extended my right arm at contact and the pain went away after a few weeks.

I also have had pain in my trail elbow for the last couple years, 40 years old so getting there in terms of age but not there yet. Swing mechanics can certainly play a role, and since I have a steep angle of attack anyway this can work against me for ground first impact. One change I did make is switching to graphite shafts in my irons. I was fitted for the 2025 T150/250 combo and I will say it made an almost instant impact for the better. Graphite shafts in irons these days are much farther along than a decade ago and I would argue are not only for senior golfers. For instance I am gaming the MMT TX 105 and I love them and the weight, while lighter, is still close to the AMT Black S300 I moved out of. Graphite absorbs vibration much better than steel, and you may pick up some club head speed along the way as well. Also, I make it a point to stretch before rounds and range sessions, that helps. My elbow discomfort has reduced substantially.

***Note - I am not a medical professional, but rather a fitness enthusiast. Discuss these items with a medical professional before adopting them, or do so at your own risk***

This episode discusses lateral/medial epicondylitis (tennis/golf elbow). I have had pretty bad epicondylitis from beating balls off a poorly padded mat or firm turf and used this protocol to rehab myself back to health. It took about 4-6 weeks of doing this every other day, but I did see significant reduction in pain and improvement in the range of motion within two weeks after putting the theory into practice.

open.spotify.com/.../6q4npQVx4DGIR5Ag2IxOHi

I had the same issue.I continued to play with it and it eventually went away. I did a couple things during that time that helped; I iced the elbow before and after every round,I also used a velcro pad/brace that I secured on the forearm, just below the elbow and I focused on lightening the grip with my right hand.

Hope this helps and good luck.

Going through this myself - tennis elbow one side, golfer's elbow the other. Probably came up from hitting a lit of balls on mats. That being said it is getting better.
Every morning I use a scraping blade on both elbows with some anti inflammatory cream. At first the pain is excruciating however it's been two weeks now and it is uncomfortable but tolerable and is working. I also do a lot of rehab working on my entire body (broken faaaaaaar too many things) and have started with some forearm/hand work in the gym. I'm coming up on my mid 50's with high clubhead speed so that doesn't help. While sitting and working at my desk I try to massage it periodically as well.

Been dealing with the same issue in my right, trail arm, all summer long. Had to take about 5 weeks off just to let it ease up. Two cortisone shots within a 5 month period. Good luck!