Great question. I’m 58, using 531 for the last 5-6 years in various ways. I ran 2x2x2 this summer ( June- August) 12 weeks. Did not like it as much as my current plan, which I’ve been using last 24 months except the 2x2x2 time.
Weeks are 351. I use the main lift as the supplemental for squat and bench, FSL. For OHP , I use Behind the neck for the supplemental,3-5x8-10.
DL , it’s SSB good morning 5x10
Add 50 reps or so from push, pull, single leg core each workout. Done as a circuit using body weight exercises when possible. Chins, push-ups, sit-ups,back extension. Rows, lat pull down,curls,
5 progression for a few cycles then a cycle or two of max reps capping at 10 on 3 and 1 week.
Lift every other day, recoverable conditioning on the non lifting days, a flexibility circuit as a warm up on lifting days and extending it on conditioning days.
Total training time between 60-90 minutes. I don’t get upset if I miss a day. I train very consistently. I rarely need to deload. I reset = check my TM when I need to, usually 3-4x/ year.
Two main lifts a day did not work well for me.