Crossword puzzle clue "billion years"

Here are the possible solutions for billion years clue

Answer
Clue
Relevancy
ages
Clue
Years and years and years
Definition
AGE, to grow old
eon
Clue
Years and years and years
Definition
a long period of time, also AEON
eons
Clue
Years and years and years
Definition
EON, a long period of time, also AEON
aeon
Clue
A billion years
One billion years
Billion years
A billion years (Var.)
Billion years (Var.)
Definition
the largest division of geological time, composed of several eras, also EON

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