The World Health Organization, UNICEF and the American Academy of Family Physicians all recommend nursing at LEAST two years.
(NOTE: it's the AAFP that recommends two years, the AAP or American Academy of Pediatrics recommends at least one year.)
There are great references athttp://www.kellymom.com
You can be gentle, you can say "I used to think that too until I did some research" or "they are learning more and more everyday how wonderful breastfeeding is, isn't it great?" followed by a *BIG SMILE*
While some people are just mean, others may be grieving following bad advice or societal pressures in the past, which makes them defensive. They may envy the support available to you and your courage. Or again, they may be mean.
And WHAT'S WRONG WITH COMFORT????
Anthropologist Katherine Dettwyler says the longer you nurse, the higher the child's IQ is.
There are still emotional, and immunological benefits, see kellymom above.