I have Ménière's disease apart from osteoporosis. So my balance is not good, to put it mildly. One thing I found that has helped me is to practice balance - not necessarily in a class but as part of the day. Putting the weight on only one foot when waiting for the lift or the bus or when queuing for coffee - essentially any time you're standing still with a few minutes to spare. This doesn't sound like much but these days I don't seem to stumble as much and when I do, I find it easier to get my footing back. I'm in my late seventies and every little helps.