My 7 year old son recently told me that he and his mother (we've been separated for a few months) check to see if she is still producing milk every now and then. In an effort not to sound alarmed I asked the results of the test, and he said that yes, she does, but that the milk tastes different.
I knew that in the past she let him grab her breast and nipples "for comfort" far longer that I would have thought healthy, but she insisted that it was good for him. But I thought that had stopped a couple of years ago.
EDIT: I think this is far too old for her to be letting him touch/lick/hold her breasts even if he currently may want to do so. I am very concerned that one day soon he will mention this behavior to one of his friends thinking it is normal, only to find out that it is "creepy" or "immature" or whatever. I would also assume that at a certain age it crosses into "illegal" territory from a sexual abuse standpoint, though I couldn't begin to guess at what age that would be.
How old is too old?