Congrats to your parents for living long and presumably healthy lives, but I'm not sure what your point is.
Circulated coins are graded based on wear. Circulated coins are graded only on wear. The grade of a circulated coin is not affected by bag marks. The grade of a circulated coin is not affected by strike. Circulated coins are graded based solely on wear. Repeat after me: Circulated coins are graded based solely on wear. And to answer the original question: I like this coin as an accurately graded 53. This is what an AU-53 should look like.