Majority

Age, generally either 18 or 22, when a minor becomes of adult age as per state law and can assume civil duties and rights such as serving on a jury or voting.

Malingering

To deliberately pretend or fake symptoms of a disease or injury to intentionally profit in some way to reach a desired end (collect insurance benefits) or to feign symptoms as the result of mental illness.
***
US: The practice of feigning illness or inability to work in order to collect insurance benefits.
***
To feign a disability for the purpose of continuing to collect benefits longer than actually necessary.