As I have gotten older I have focussed on recovery, I train on a 10 day split, which everyone will tell you is not productive, but I even tried it on a young bloke, and everyone accused me of having him on drugs.
It goes like this
Monday : Chest
Tuesday : Quads
Wednesday: Rest
Thursday : Shoulders & Traps
Friday : Hamstrings & Calves
Saturday : Rest
Sunday : Rest
Monday : Back
Tuesday : Bi’s & Tri’s
Wednesday : Rest
Thursday : Repeat
Like I said, a lot of people will say it’s not enough, but I had a 16 year old on it and he just blew up, but it’s my recommendation for over 40’s focussing on recovery. I’m now 62 and still killing it.
Basically triceps get stimulation on chest and shoulder day, bis get stimulation on back day, if you squat/hack squat **** to the grass, hamstrings will get hit on quad day, and if you really feel you must hit arms more often you could do extra tri’s on chest da & throw some bi’s in on shoulder day.
I always do quads seperate to hams and calves, because after quads you aren’t going to give hams a solid go, let alone calves.
How many people do you see with great quads, mediocre hams, and no calves.
But, pretty well anything works, if you train hard, eat right and recover.