Nipples suddenly hurt after 2 years of breastfeeding

Mo

So 5 days ago, my nipples started hurting from my son breastfeeding. He turned 2 last week. I havent had this pain since after his first month.

Could it be that they hurt from breastfeeding so long?

I took a pregnancy test at 9dpo and it was negative.

Was not ready to wean abruptly, wanted to wean slowly but it hurts only when he is feeding and twiddling.

Has anyone experienced this?