I mean, I'm sure he does. But his head is too small and all the coloring is very weird, particularly relative to his son.

maybe there's something about protein levels in the blood?

It's pure hookem.

I've heard that protein levels in blood fall pretty drastically when you hit 30's and again in the 50's and 70's

Certainly possible, but transfusions don't solve aging. This is a symptom of a decline in function, not a cause.