hot flushes post menopause - they're back with a vengeance!

Do they actually ever go? I'm 60, I've gone through the menopause several years ago now (I had a Mirena coil so unsure of the exact time but probably about 8 years ago). Anyway I haven't had a hot flush for a while but it seems they're back. I know it's hot at the moment but I'm sitting in an airconditioned office and it's making no difference. Also has anyone been started on HRT after the age of 60? It's something I want to ask my GP about but would like anyone's thoughts on this please