People in their 50’s do retrain as nurses OP. Admittedly, they tend to be early fifties, qualifying in their mid-50’s rather than qualifying in their 60’s but still.
I think you need to seriously consider the physical and academic demands of modern nurse training. How long have you been out of education? Even if you don’t want to work shifts when you qualify, you will have to work a shift pattern including nights, days, bank holidays and weekends for the duration of your 3 year training. As well as the mental strain of completing academic assignments. It is not an easy course.
As a career, nursing is on its knees. Nurses are burning out at rates like never before. These are experienced, passionate nurses who have lived and worked through plenty of other crises in the profession btw. I left very recently. My PIN (professional registration) was up for renewal and I just couldn’t bring myself to do it, despite loving my job, the unsafe practices (staff:patient ratios, lack of training, chipping away at services, so much more expected with so much less interms of resources etc) and lack of support from management meant that I just couldn’t do it. Too stressful as it was having a negative effect on my health.
I’d counsel anyone to think seriously about entering the nursing workforce at any age. It is more than just a career. There are many other ways to contribute to society and ‘help people’ without becoming a nurse. Especially if you are qualifying at 60+.