[RoosterRedux]

But in my opinion the real key to my good health is daily mild aerobic exercise for 25 minutes.

That's good. I would recommend HIIT a couple of times a week and weight lifting (not too heavy, not too light).

Strength is more important than ever, as you get older.

I do both (vigorous cardio and lifting) and can attest to the benefits of such. If you have joint problems, work around them.

[Bobbyvotes]

Weight lifting is not necessary in old age. I do treadmill with 1 lb weights on each wrist. There is no need to build extra muscles. That makes us more hungry. Walking on treadmill with wrist weights keeps my arms and shoulders strong.