Breastfeeding

I know it depends on the child and the parent but I just needed to vent a little. I personally don't mind people breastfeeding . I have Absolutely no problem with it but I do think that at the age of 6 that's something you should stop. Sorry if I offend someone but I just have this friend that still breast feeds her 6 year old and i just think at that point it shouldn't happen. The Childs already in kindergarten and I honestly don't think it's needed at that age anymore . Am I the only one who think this ?