I'm 44 and also find lower volume works best for me as in I'll do just the minimum reps for whatever day it is.
Here's a week for me:
Day 1: Squats and abs
Day 2: Prowler
Day 3: Bench supersetted with chest supported rows, dips, and sometimes shrugs
Day 4: Prowler
Day 5: OHP and deadlift. No assistance or supplemental as I superset the main lifts which taxes me. OHP then DL.
The only deviation I use is what I saw coined as the bastard template. I work up to my top set then go back down.
E.G. for a 5 reps week (65/75/85)using 260 as the training max so the top set would be 220 lbs:
Warm up sets
5 x 30% of top weight for that day (example: 220 is top work set so this set would be 66 lbs rounded either up to 70 or down to 65).
5 x 40% of top weight for that day (220 * .4 = 88 rounded up or down again)
5 x 50% of top weight for that day (220 * .5 = 110)
3 x 60% of top weight for that day (220 * .6 = 132 rounded again)
2 x 70% of top weight for that day (220 * .7 = 154 rounded again)
1 x 80% of top weight for that day (220 * .8 = 176 rounded again)
1 x 90% of top weight for that day (220 * .9 = 198 rounded again)
minimum reps x top percentage (85% of training max ) of the day (220 * 5 reps)
minimum reps x 2nd highest percentage (75%) of the day (195 * 5 reps)
minimum reps x 3rd highest percentage (65%) of the day (170 * 5 reps)
more sets of the last if I feel like it and have time
Occasionally, I'll do a set or two of FSL (in reality, it would be LSL as in Last set Last because I did them backwards. Based on my example after completing 5 x 170, I might do another set or two of 5 x 170).
This has worked extremely well for me over the past few weeks. There were times when doing the 5/3/1 as written, the first work set was a grind and mentally I was fearing the heavier work sets. This way, I feel much better if I can get to the first work (heaviest) set as the ones after should be easier.