I committed the sin of net reading all the replies.
I'd like to comment on a few things, but as a disclaimer I will admit that I have never breast fed any of my kids. I am not anti nursing, but my kids are adopted, so there just wasn't that decision to be made.
I think it's funny that people think they are saying that Time is trying to sexualize extended breast feeding by portraying a "thin and pretty" mom. I don't see why all moms have to be portrayed as dumpy, or sloppy, or whatever. Moms can be attractive and stylish, whether nursing or not.
Yes, in other countries moms nurse until 4 routinely, but that is mostly in 3rd world countries where food and clean water supplies are not plentiful and mothers do whatever they can do to ensure that their children receive adequate nutrition. In developed countries there is no need for this. If you have an adequate food supply to provide your 4 year old with adequate nutrition then breast feeding at 4 is for a psychological reason, either the mother or the child's. ...and supplying your child with adequate nutrition does not mean you have to use cow's milk. There are many children that are raised without cow's milk, for whatever reason, and still do not nurse until age 4.
I have a 4 year old (or if you would prefer 51 months) I cannot imagine her nursing, or wanting to nurse. She is my 3rd of 4, and usually by 4 kids see themselves in the big girl/boy stage, and I would think view that as "for babies." My 4 year old is very much aware, and will make it very well known that she is "not a baby!"
My opinion on the "mom enough" headline, though I admit I haven't read the article, is to ask, "have you ever met some of these people?" LOL
I have been accosted by the people who feel the need to inform me of what is best for my child. I had a woman sit down next to me while I was feeding my youngest son in WDW and lecture me on "breast is best." As I said earlier, my kids are adopted. I am blond haired and blue eyed, my husband is blue eyed and fair skinned/freckly (no hair LOL), all of my children are African-American. My youngest being the lightest of them all, but still, it is very obvious that he is not genetically ours. Yet, still, this woman had to give me the lecture on the bottle. My point is it is really none of her business how I choose to feed my kids and why.