Crossword puzzle clue "they're all that matter"

Here are the possible solutions for they're all that matter clue

Answer
Clue
Relevancy
age
Clue
"___ is an issue of mind over matter.If you don't mind, it doesn't matter." (Mark Twain)
Definition
to grow old
idea
Clue
Matter for the gray matter
Gray matter matter?
Gray matter matter
Definition
a conception or a plan
makeamentalnote
Clue
Put some matter in the gray matter?
atoms
Clue
They're all that matter
All matter, essentially
Definition
ATOM, the smallest particle in an element which can take part in a chemical reaction
doh
Clue
"Yeah, that's what they all say. They all say ___": Chief Wiggum
Definition
a musical note

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