no, i specifically pointed out earlier that we only begin to lose lactase after about the age of two. That is a lot of qualification.
just because we all begin to get farsighted after about the age of 50 doesn't make us all start to use glasses at 50 either, i suppose.
i am surprised to see that you mention the bit about the paediatricians and 9 months but did not also highlight the part where she responds to it shortly afterwards with a detailed "However..." which i think is an excellent insight.
i think that there is a lot we can learn about ourselves from cross-cultural and cross species anthropology. It isn't an exact science, i agree, but much good anthropological research supports exact sciences and vice versa.
one example is that the human immune system doesn't seem to mature fully till the age of 5 or 6. Hence the immunological benefits of breastfeeding remains as useful till then. The nutritional benefits, while on the surface less important, is a matter for interpretation. No one would suggest giving up apples merely because you eat an otherwise varied diet an apple a day only has a small nutritional benefit compared with the rest of stuff we eat.
Besides the immunological benefits, especially when the majority of babies around the world don't have access to safe drinking water, why should the emotional reasons to bf be less valuable than the nutritional ones? A two yr old has incredible emotional stresses because they are fast becoming aware that they are also a social animal and strongly desire to conform yet also have to deal with their self-centredness and misinterpetation by us and them of what is expected. To find the emotional support at the breast is a great way to reassure an upset, even physically hurt toddler.
as far as whether or not your children could suck properly, i think that it is more likely you did not get appropriate support by knowledgeable people when it was vital. there are a few reasons why some babies can't suck efficiently, tongue tie which may not be easily visible to the untrained eye and cleft palate which is. Besides those and with children born with special needs i can't think of any other reason myself, as a non professional, why your babies didn't bf successfully. The main thing to understand is that most women in our society don't bf successfully not because of inability or the desire to do so but because of lack of support in the medical and cultural community.
sorry this is so long but i hope it was useful if you got to the end.