I really don't want to sound as though I'm picking on you, imananny, as you have backtracked very graciously, but you did start off by saying "I have always said if you can walk and talk and ask for it,then you are too old", which would imply that you think 18 months is too old, never mind 3 years?
(Personally, agree entirely that if mother wants to stop bf 3yo then she should, think SN should butt out of pontificating about how it's of no nutritional value (huh? Would she stop parent giving child cow's milk because it's "of no nutritional value?" Is there something unusually deficient in this woman's milk that means all the nutrients have been magicked out of it?), and am concerned that someone who clearly thinks that extended bfing is a bunch of indulgent weirdy hippy crap that's all about control and has no other benefits to begin with may not have the most sensitive approach to weaning from the breast when the mother wants to)