My mom is 46 years old and she still has milk and she hasn't bresatfed since I was a yr old and I'm 23 now. She did have my brother 2 1/2 years after me but never breastfed him. But for some reason she lactates to this day! My best friend also still lactiate and her last child is going to be 4 this year so I have no clue what to do about it but I don't think it's a major problem as far as something being wrong! I think everyone is different on how their bodies react to things!