Mutual support groups whose members are people who have a disability, illness or other health condition, their families and friends. The groups meet in-person, by telephone or via the Internet; and provide an opportunity for participants to share information, resources, practical tips for daily living and encouragement about issues related to the disability or health problem.

Mutual support groups whose members are family, friends, significant others, non-familial caregivers or attendants who are caring for someone who has a temporary, chronic, life-threatening or terminal illness or disability or who is elderly and increasingly unable to provide for his or her own care. The groups meet in-person, by telephone or via the Internet; and provide emotional support, information and resources to help participants ensure their own well-being while remaining involved in the intense care of a loved one. Also included are care receiver support groups that help people who have a caregiver cope with the fact that they require care. Care receiver support groups are often offered in conjunction with caregiver support groups and are structured to allow care receivers to participate in their own group while their caregiver attends another.

Individuals who are age 50, 55, 60, 62 or 65 or older depending on the minimum age for qualifying as an older adult which varies by program.

Family members, friends, neighbors and others who assume responsibility for attending to the daily needs of individuals who are temporarily or permanently unable to care for themselves due to general frailty; illnesses, injuries or progressively debilitating conditions such as Alzheimer's disease or mental illness; or other incapacitating problems without compensation. Some, but not all, states have programs that help people pay for the caregiver of their choice, and in certain circumstances that can be a family member. Most of these programs have income and other eligibility requirements that the care recipient must meet, and strict rules often apply as to who can be paid for the caregiving. Benefits may also be available for veterans and their families through the Veteran's Administration.

One of a group of conditions called motor system disorders which result from loss of dopamine-producing brain cells. Symptoms of PD include tremor (trembling in hands, arms, legs, jaw, and face), rigidity (stiffness of the limbs and trunk); bradykinesia (slowness of movement) and postural instability (impaired balance and coordination). As these symptoms become more pronounced, patients may have difficulty walking, talking, or completing other simple tasks. The disease usually affects people over the age of 50, can be difficult to diagnose accurately and may require brain scans or laboratory tests to rule out other conditions.