Dawg, I'd go ahead and add the strength and cardio now, plus mobility work, I think you'll make faster progress
Just don't overdo it, a good setup for general fitness would be something like this
Monday, Thursday: strength
this can and should be very basic, an upper body pull, and upper body push, squats, deadlifts A sample:
Monday: Lat pulldowns / pullups, bench press, DL
Thursday: Barbell row or seated row, Overhead Press, squats
Tuesday, Friday
conditioning, walk, jog, do wind sprints, make yourself sweat
Pushups ,inverted rows, unweighted squats in a circuit, squat thrusts or burpees, you name it, it goes here
Wednesday: mobility work
stretching, dynamic mobility exercises (bear crawls and such) or just do some easy beginner yoga
this works for us older fellas if we're not stupid about how fast to progress
the strength work will help retain bone mass / density as well as muscle, the conditioning will improve cardio health and endurance, and the mobility work will keep all the moving parts greased up and moving smoothly
as bad as my mobility is, I do a this every day, to keep things moving
https://bretcontreras.com/5-things-you-should-do-everyday/