I totally agree with the "listen to your body" comment above.
I always leaned toward lifting heavy, powerlifter style, all my life. But now I'm 52 and no one needs to tell me that I am better off with lighter weight, more reps, less time between sets, more stretching, and more cardio in my routine.
I don't want to throw 5 plates on a squat bar ever again. It doesn't feel good, and working back up to that strength more than likely would lead to an injury.
But when I was 45 or so, I was still lifting pretty heavy and competed in some natural competitions. What happened between 45 and 52? Just a change in priorities, and a feeling from my body of what I need, and what I no longer need. Everyone's clock is different. For some guys, their "strong days" are over after college football, for others it goes into their 60's or beyond.
I'm still pretty strong for an old coot, but I measure my strength by my best set of 6, rather than singles or triples etc.