Photo is only disturbing because it's in a public newspaper.
Breastfeeding until the child decides to stop is completely normal and healthy for mother and child. I know several people who breastfed up until 4/5 but weren't open about doing so because of the stigma attached.
Breast milk contains antibodies specifically for your child's needs. That doesn't stop just because they're not a baby.
We are so conditioned to see breasts as a sexual object in this country we confuse that with their primary function.
I love this picture a zoo in Australia put up the other day, try telling that rhino there's no benefit after a year...