My mom was either placed back on the pill or continued her prescription at 49/50. I remember she was in the process of going from being a widow to remarrying and she was surprised that her doctor told her that even at her age babies are still possible.

So no, to me, 50 isn't unusual to not have started menopause yet.

As far as heavy cycles, if unusual and 'soaking through', then of course, see what it is. Fibroids could cause that.