sue23, as others have said, you don't have to stop taking HRT if you don't want to and nobody should be forcing you to do so unless you have a very serious health problem that prevents you from using it.
There is no age limit for taking HRT and many women use it well into their 70s. I am 55 and an HRT lifer with no intention of stopping, ever.
If it ain't broke, don't fix it and if you are happy with your current regime then my advice is don't change it!