Snap, I didn't know you were 50 now. Happy belated birthday
Like Snap, I started competing in my 40's; also at 43. At that time, I was very lean and recovery was easy. While, at 51, I'm still quite lean, recovery is more of an issue. At about 48 I found I had to put a lot more thought into my training structure. If I did too much, my lifts started to tank because I wasn't recovering.
As for diet and training, it would depend upon what your goals are. Mine are strength and aesthetics aren't a concern.