It's only considered "extending" breastfeeding/nursing in the US.
Mayim breastfeeding her son on the subway at 3 years of age :) Go Mayim! Mayim Bialik Opens Up About Her Breastfeeding Challenges and Becoming a Lactation Educator - Mothering Community
This may seem weird but I clean/boil/sanitize my empty chapstik containers and fill them with breast milk, freeze them & whip them out to rub on my kids ouchies to help heal them.
I enjoyed this thoroughly - 15 Ways Breastfeeding Completely Messes With Your Sanity
The Problem With 'Extended' Breastfeeding. Nursing past infancy is normal and healthy.