Working a teacher, I became very ill at 58, but was not eligible to retire until I was sixty. Sorry, but your post is inaccurate, GSM.
My husband worked in HR in local government, so he was able to help me negotiate the minefield.
I had no salary for six months until I reached sixty and then was able retire on ill health, long before I intended too.
Furthermore, my pension was not a great one, because I had only been teaching for twenty five years and I had just missed getting my state pension until sixty.
I didn't get it until last year at sixty six.