Extended breastfeeders: When did your child self wean?

My 2.5 year old still nurses on demand. She is my youngest. My older children slowly lost interest at about 2 and would only nurse in the morning or at bedtime. This is the first time I’ve had a milk obsessed toddler who requests to nurse several times a day, I’m talking up to once every couple hours! I’ve read that kids can self wean from 2-4 . And I’m just wondering what others experience has been.