I just finished potty training my little girl and she is 3. I wish wish wish I had listened when everyone said she will when she is ready. I introduced the potty at about 22 months and we worked off and on with it, never pushing it but we did everything from the potty movie to books to baby dolls to sticker charts. Finally we just told her that 3 year olds don't wear diapers about a month before her birthday and kept talking about how she was going to be such a big girl.
Long story short when she was ready it took less than a week with all of one accident. It has been about a month now and while we have a few accidents a week- mostly at night... it was scary how easy it was. When you child is ready it will come... we stress ourselves out trying to make things happen on our time scale when its theirs we need to be worried about- each child is different... I have heard kids do best at potty training between the ages of 2 1/2 and 3 1/2. Good luck