" Alaska’s per-capita senior population growth has led the nation for seven years and counting, according to the Alaska Commission on Aging’s FY 2016 annual report."   

Uhh, yes,  it *also* says that the reason for that is because of the aging of a large cohort of fairly young people who moved here in the 1970's who are now "seniors"  and have remained in Alaska.  There's is absolutely no support in the report for your claim that there is a net in-migration of older persons into Alaska.