I’m the same age.
I break the resistance training into three days through the week: Chest/Triceps...Biceps/Back...Legs and Deadlifts.
I’m often still a little sore by the time they roll around again the following week. So I lighten the overall load for that week, but still do the work.
You prefer lighter, full body workouts 2x week?
Definitely not lighter. I don’t recommend a heavy workout to people of a certain age who do not have the know how, but I challenge myself fully. After 20 years as a fitness trainer, I know how to push the limits in a safe way. The three day system is a good one, and one I used for athletes. For the average person, and I now count myself in that category, I prefer to use total body.