Check the age hook picks the right date

The age fixture had one branch whose author and committer dates were
the same, and its only tag was lightweight on that commit. Sorting
oldest first, writing the author date or reading every ref rather than
the branches all passed, and the expected date came from the same
for-each-ref the hook runs. The dates now disagree on every one of
those points and the hook's answer is held to a literal date, under
every shell.

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