In 1958, the AARP was organized to promote employment opportunities for the disabled
a mandatory retirement age of 65
health insurance for retired Americans
activism for Native Americans

I Think the answer might be Employment opportunities for the disabled.

Explanation:

"Since its inception in 1958, AARP has grown and changed dramatically in response to societal changes, while remaining true to its founding principles:

To promote independence, dignity and purpose for older persons

To enhance the quality of life for older persons  

To encourage older people 'To serve, not to be served'"

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.