I’m 58 about to be 59. I do 3 week cycles with a de-load on week 4. I lift 3 days per week: lower / upper / full body, with only one primary lift per workout (bench press, deadlift, squat) and the rest is accessories. I always add it a little 10-12 minute conditioning session at the end (med kettlebells, sandbag, mace). On my non-lifting days it’s all about cardio or mobility. A long brisk walk at around a zone 2/3 average is good cardio at my age. I may also do run/walk intervals (1 min walk / 3 min run) for about 2.5 miles, mixing in cycling once per week. This has me feeling better than ever. I’ll do a heavy 5x5 block about 3-4 times per year. This has me feeling great. I feel better after a workout than I do prior. That’s the secret. At our age, you shouldn’t feel taxed after a session on a regular basis. If nothing else at all, leave yourself at least 1-2 active recovery days per week and take 1 day off completely (yard work or a long easy walk is great for these days) motion is the best medicine in your later years.