I managed to breastfeed my first child 'till he was 18 months and second child 'till he was 12 months. I had some fantastic information and support from La Leche League and attended their groups both ante and post natal.
Spoke to the teacher-practitioner at my local university where the post-graduate course is run and she said, "Oh I wouldn't mention that on your application. The La Leche League are a bit too extreme and left-wing."