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I asked my wife, and she said he doesn't look any younger than any other person who has a good skin care routine.

the guy looks like a ghoul, his health metrics might be good but he looks way older than his age.

You can easily tell by the sunk or deflated skin on the face. Compare the kid’s face and the dad’s face.

I wonder if there is a term for the subcutaneous fat or whatever that goes away as you age.

i think it's collagen

There is: aging

In a video with Will Tennyson he mentioned that he keeps his body fat at 5%. Such low numbers will naturally give you a sunken look.