For regular "Fitness for Life" people, two days/week of heavy weights (powerlifts) is good. (That is part of the Maggie's Fitness for Life program - plus 2 days with HIIT Cardio and one or 2 days of calisthenics and endurance "cardio". 6 hours/week is not too much for anybody).
(A reminder about Powerlifts: These are mostly full-body, or multi-muscle group/compound exertions: Bench Press, Deadlifts, Barbell Squats, Rows (dumbell, TRX, seated, barbell - whatever), Military Press, and pull-ups or pulldowns.) Depending on general health and taking into account past injuries, these are sturdiness basics regardless of age or sex. Ordinary people should not push their powerlifts two or three days in a row because recovery is needed. For a good discussion about powerlifts.
So-called Accessory Weight Exercises are good time- fillers, and do not need the sorts of recovery that the powerlifts do. Here's a partial list:
Curls of any sort
Tricep exertions of any sort (dips, push-downs, skull-crushers)
Shoulder shrugs
Leg machines (ham curls and quad lifts)
Calf lifts
Do any of our readers do Accessory Weights and, if so, what?