ssh passphrases and sarbanes oxley (SOX)

Hi, group!
This question has been addressed to me by a client and I couldn't find
a solution on the web yet:

As Sarbanes Oxley requires policies like password to be enforced, how
is this handled in ssh/openssh?
Is there an option to apply aging to a key passprase.
Would it make sense?

Sorry to be so unspecific!
Regards, Markus