Turning 65 while actively employed is NOT considered an IRS Qualifying Event.
You should, however, contact your local Social Security office up to 3 months prior to turning 65 and enroll in Medicare Part A. Most individuals receive Medicare Part A at no cost and it will act as a secondary insurance to your group coverage through Northwestern until you retire. Your NU health plan will continue to be your Primary health insurance payer while you still work at NU.
Please note that individuals enrolled in Medicare parts A or B are NOT eligible to contribute to a Health Savings Account.