Facial sagging, what are its causes, prevention and rejuvenation methods?

One of the things we worry about as we age is sagging facial skin.

Every time I look in the mirror, I can't hide my sadness when I see that my cheeks seem to have sunken more than before and the wrinkles on my nasolabial folds are getting deeper.

I've noticed that this sagging in my face is becoming more noticeable as I get into my mid to late 40s.

Is it true that facial sagging is simply a result of aging?

I'm asking because I think we need to find out the cause and deal with it.
I'm curious as to what causes facial sagging.
I vaguely know that the main cause is movement of the subcutaneous fat layer.
Is it true that facial sagging occurs due to these complex aging phenomena?

Besides hospital procedures, I'm curious about ways to prevent facial sagging that can be done at home.
That is, I would like to know if there are any bad habits (e.g. sleeping on your stomach, frequent frowning) that accelerate the sagging of the face.
& I would appreciate it if you could explain Maypure's method to reduce the depression caused by sagging face and restore elasticity even now.