I'm 36 and I've now transitioned from being a natty quasi-powerlifter to a natty bodybuilder. I should have done it earlier. I haven't hit a strength PR in years.
I started with a strength programme called Greyskull LP which descends from the Starting Strength school of thought (although far superior IMO). I got some really good results with it. I'm naturally quite strong, so it took less than a year before I was doing things like 200kg deadlifts. I would watch other natties in the gym and, according to my own observations, I was usually the strongest guy in the room.
But the easy progression quickly stops. Once you get to lifting 2.5x your bodyweight off the floor, or dipping with 100kg attached to your waist, it starts to become really hard. I mean, yes, you've trained for it, but it's still incredibly taxing on the system and, let's be honest, not reflective of any real work anyone might carry out. Real work involves lots of toing and froing, not lifting one enormously heavy weight then going home.
I developed a really hard to change mindset that said if it's not heavy there's no point. I was still doing 3x5 reps of everything, often to failure, after years and years of lifting and never making any strength gains anyway. I eventually developed an elbow injury thanks to too many weighted chin ups. I prided myself on being able to chin up 3 plates when most people can't even do bodyweight. Well, now I can't do bodyweight either (not without pain at least).
I made the change after watching some of Scott Herman's more recent videos on Youtube. He's now 39 and still in excellent shape. Unlike most on Youtube, I believe he is natty too. He does high volume work which, naturally, will be nowhere your strength limit. I was still doing 3x5 reps, now I'm doing 3x8 with drop sets. Way more volume, way more variety of movements, way less weight. It's been so much better.
I'd still recommend a starting strength programme to beginners, but you really need to get off it after a year or so and decide whether you want to be a bodybuilder or strength athlete. And before you decide to be a strength athlete, look at seasoned strength athletes and decide if you want to look like them when you are their age, or not.
As for juiced bodybuilders/athletes, don't even consider it. You think you'll get more women (be honest, that's why you do it). But, in fact, the love of your life doesn't care how strong you are or if you are 10% body fat. All you'll do is destroy your body. Lifting heavy just destroys it even more (see Ronnie Coleman).