A year and a half of hard work
I'm 43 now. Around my 42 birthday, I decided to start taking fitness seriously again. I committed to lifting 3-4 days a week, started walking at least two miles on my off days, and gave up drinking for 6 months (I've since cut back drastically from my previous consumption).
I dropped around 13 pounds while putting on a pretty decent amount of muscle. All my lifts are up, even though I'm lighter than I've been since I was 28. I take creatine and recently added a multivitamin and fish oil. About halfway through, I started tracking macros with a phone app.
People will tell you that you can't get in shape in your 40s but, while it definitely isn't as easy it is when you're young, it's completely achievable. You don't need TRT/growth hormone/whatever. Just stick it to. I'm in a calorie deficit now, trying to drop around 7 more pounds, then I have some strength goals I want to hit, probably in a small surplus.