I was still getting periods every single month regular as clockwork at age 56. I went on hrt, patches and utrogestan which I could not tolerate in September last year. I then went for the mirena coil in order to stop bleeds.
Even now it has settled I STILL get pms every month, had a light period last month, pms but no bleed this month.... So at age 56, despite being on hrt, I too still know I would be having natural periods. Late onset menopause seems to be something a lot of medical folk just think is not possible... There's enough of us on this forum to know it is very real!