Javadoc
Specifies the maximum connection age that should be used for connections
that were created in order to replace defunct connections. It is possible
to define a custom maximum connection age for these connections to allow
them to be closed and re-established more quickly to allow for a
potentially quicker fail-back to a normal state. Note, that if this
capability is to be used, then the maximum age for these connections should
be long enough to allow the problematic server to become available again
under normal circumstances (e.g., it should be long enough for at least a
shutdown and restart of the server, plus some overhead for potentially
performing routine maintenance while the server is offline, or a chance for
an administrator to be made available that a server has gone down).