The term developmental disability means a severe, chronic disability of a person which:
(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: (i) Self-care, (ii) receptive and expressive language, (iii) learning, (iv) mobility, (v) self direction, (vi) capacity for independent living, and (vii) economic self-sufficiency; and
(5) Reflects the person's need for a combination and sequence of special, interdisciplinary, or generic care, treatment, or other services which are of lifelong or extended duration and are individually planned and coordinated.