I was 63 yoa when I landed my first job as an RN on an acute care unit. I turned down two SNF jobs and ultimately two other hospital jobs ( I had landed this one already) before I started working here (six months after passing the NCLEX and quitting my CNA job at a hospital that refused to interview me, to the chagrin of the RNs on my unit who wanted me to hire on badly. I'm a damn good nurse). I was relentless in my job search and knew what I wanted (acute care). I applied all over the country (none in the south except FL, once, and that reluctantly) and attended online and virtual job fairs. I interviewed in person in three surrounding states and at multiple hospitals in the state in which I graduated. I got turned down beau coup times. I have an ingrained hatred of HR dept's that will last me a life time.
You need to apply to a federal institution through USAJOBS - The Federal Government's official employment site The variety of RN jobs is astonishing, and ranges from Forest Service to Prisons and everything in between. The system is sloooow. Took me six months to get here. I'd suggest looking at VA. They'll give you a bit of credit for your BSN. I understand IHS is no longer hiring new grads w/o experience, but again, don't take anybody's word for anything.
I was never asked my age (it's illegal and federal service is under the microscope, plus, because of need, based on my application and a phone interview, I was offered a live interview and was hired), and apparently I don't look it, but I'm obviously older than 50. Attitude counts for a lot. Any federal service you have under your belt will count toward your retirement too. You can PM me for more details.