A developmental disability is any severe, chronic disability of a person that:
(1) Is attributable to a mental or physical impairment or combination of mental and physical impairments;
(2) Is manifested before the person attains age twenty-two;
(3) Is likely to continue indefinitely;
(4) Results in substantial functional limitations in three or more of the following areas of major life activity: self-care, receptive and expressive language, learning, mobility, self-direction, capacity for independent living, and economic self-sufficiency; and
(5) Reflects the person's need for an array of generic services, met through a system of individualized planning and supports over an extended time, including those of a life-long duration.