I am 59 and went through the menepause about10 years ago - I sometimes get a bit of bleeding - not often - only happened about 6 times in all - not much blood really - nothing like a proper period- is it anything to worry about?

It is hard to say if it is something to worry about or not.

Is it a once a month type thing? How often does it happen?

This is really something that you should address with your health care provider.