I powerlifed for years, with a truly excellent coach for much of that time. For what it was worth, she was Starting Strength certified and a successful international masters competitor. She fixed a subtle problem with my deadlift using nothing but the wrinkles on my T-shirt; my recovery improved dramatically.
At 40, I was stronger than I was as a high school wrestler. I loved lifting. I remember casually picking up a piece of equipment that took two burly guys to lift and jumping down from a pickup with it.
But over the course of several years, I picked up several small but persistent injuries lifting. Two can be worked around. One makes it very hard to squat for more than a few weeks of training. None of the injuries, fortunately, affects me noticeably in daily life. But I'll never wide-grip bench press again, either.
When I was coming to terms with these injuries, I had a long talk with the oldest natty lifters in my gym. The powerlifers were all dealing with various chronic injuries. (Seriously, Rippetoe has published a bit of his medical history. He's a mess of injuries.)
But you know who was still lifting in their 60s and even 70s, injury-free for decades at a stretch? The natty bodybuilders. One of the oldest looked over at me one day, and said, "You know, I don't like the risk/reward on heavy squats. You do them flawlessly for years, and then one day, a group of muscle fibers decides to misfire for a moment when you're under the bar."
So, enjoy Starting Strength, or whatever other beginner program Reddit likes this year. And the two Starting Strength certified coaches I've known were excellent. Good technique is absolutely worth it. But once you've gotten those sweet beginner gains, talk to the old lifters, and think long and hard about where you want to go next. Because nothing is as important as remaining injury-free. And every older powerlifter I met was dealing with chronic injuries.
Once gains get difficult, think about what you really want out of lifting.