It isn't super common, but I wouldn't call it unusual either at that age (and definitely not unusual physiologically), I think it becomes significantly less common as you approach 2 in Australia and I imagine NZ, despite the WHO recommendation that BF continues to at least two. I think the thing is, people talk about or display their discomfort or disgust, but don't say way to go Mumma if they think it is a good thing or aren't fussed either way. I think it is wonderful that you are BF at 14 months, but if I saw you I wouldn't make a comment unless it was to back you up if I heard someone having a go.
As far as my own family goes, I believe in BF to at least two, and as far beyond that as the child desires. My eldest is three and has not elected to wean so far, but expect she probably will sometime in the next year or so. I have had negative comments from friends, and support from others (sometimes those one would least expect), I am confident I am doing what is in my children's best interest, so try to let it go. smile