What is Legal Incapacity?

Legal Definition
This expression implies that the person in view has the right vested in him, but is prevented by some impediment from exercising it; as in the case of minors, femes covert, lunatics, etc. An administrator has no right until letters are issued to him. Therefore he canuot benefit (as respects the time before obtaining letters) by a saving clause in a statute of limitations in favor of persons under a legal incapacity to sue. Gates v. Brattle, 1 Root (Conn.) 187.
-- Black's Law Dictionary