Does breastmilk change in nurtitions after 1 year old?

Bl

I'm donating extra breastmilk to a 4/5 months old baby

My baby is almost 9 months old I'm planning to donate my milk if I'll keep having over supply up to a year but was wondering if your baby is over a year does the milk change in nutrition or it stays the same do I have to spot donating milk once my baby turns one ?..

Thanks in advance:)