This is quite easy to find actually. Stay out of the city and go to the suburbs. They are full of 45 + ladies who usually are more thickly built. Try western suburbs for example.

Towards the city, there's a few places in the old Newtown strip with such women.

I saw a shop in the city on Sussex st near china town with this age range. A bit too ugly for my liking, but it's the only one Ive seen in the city with this age range.