Margaret Rhodes was born on 9 June 1925 in London, England, UK. She was married to Denys Gravenor Rhodes. She died on 25 November 2016 in Windsor, Berkshire, England, UK.
I'm perfectly certain the Queen will never retire as such. Because it's not like a normal job and to the Queen, the vows that she made on Coronation Day are something so deep and so special that she wouldn't consider not continuing to fulfill those vows until she dies. I'm sure she will never abdicate.