Not saying your training order is wrong, but it doesn't seem optimal. Squatting and deadlifting use similar muscles. as do bench and press. I'd split the movements up If I were you. I'd do what you most need improvement on to Monday. This of course assume you have weekends off and you'll be the freshest on Monday. If you work rotating shifts like me, it doesn't matter cause I'm fk'd up all the time.
Anyways, Squats or (deads) on day 1, bench or (press) on day two, Deads or (squats) day 3, Press or (bench) day 4. I enjoy Mon-Squats / Wed-Bench, Friday- deads, Sun- press. you could go M, Tue, Thur, Fri, whatever for a 4 day a week. 3 days/ week could go Mon (S)-Wed(B)-Fri(D) Mon(P) Wed(S), Wed(B) etc,, see?
BTW, I'm 40 and I DO set PR's every week. It may be 1 more rep, 5# more weight or both. In 5-3-1 if you set your training maxes conservatively, you will set PR's all the time. That's the beauty of the program, constant progress. When you don't meet the required reps, reset your training maxes. This is all i the 5-3-1 book, which I suggest you get asap if you plan to do 5-3-1- and haven't purchased the book yet.