Very good answer above. If you've had children, and have reached menopause now, it's only natural for you to be left with a tummy, everyone (bar a few lucky ones!) is the same. Menopause tends to make women put on weight in this area, as I've seen happening with my mum (I'm 30, but weigh twice her weight, so I DO know about tummys too! lol)
If it's only having a tummy you're worried baout, then all advices above are good. If now you've lost LOADS of weight, or have one of those "aprons" left from pregnancy, then you can have reconstructive surgery should you wish to. But for only a bit of tummy, I wouldn't worry hun! :O)