If —
(a) a
person is under 18 years of age when a cause of action accrues to the person;
(b)
during any time after that time the person is suffering a mental disability;
and
(c)
different limitation periods for commencing an action on the cause of action
are provided for under section 7 or Division 1 or 2,
the limitation period
for commencing the action is the longer of those limitation periods.