Breastfeeding 1 year olds?

i know that its best feeding a newborn breatsmilk and i did but then i stopped for a while and now im pumping as much as i can right now, but my daughter is almost 9 months old and im not even getting enough to feed her right now yet, if i get enough by the time shes 1 year, will it still be just as nutricious? or is it less important and less nutritious when shes a year? thanks. is it even worth it? thanks.