You could have a while to go. Some self wean in their second year. Many self wean when mum gets pregnant again (around month 5 your milk starts to change flavour) but the WHO reports 4 as the average age for weaning, I think.
Neither of mine showed any signs of self weaning at 3 and 3.5 - but then ds2 did explain that my mummy milk had a chocolate flavour that was better than sweeties!!
Most people find that it is easier to distract a 2 - 3 year old, and cut back on feeds. Feeding a 2 or 3 year old is lovely though - and a lot less about nutrition, more about comfort. DS1 used to feed mainly when he had fallen over or was tired - very snuggly and snuffly!
I think it varies a lot. DD1 stopped of her own accord at 2y - I was 5 m pg and I think that was a major factor - she definitely noticed a change in the taste. DD2 stopped not entirely of her own accord at 3y6m.
I think, it is actually more like 7 years old...that a child may still breastfeed....although in western soceity rarely and 4 years old seems to be more commenly reported....but, I would think in our society even that is relatively rare...
thing is, normal for society might end a few days if bf at all, iykwim...
it is often 30second feeds though. i went back into normal bras at about 20m. i like that feeding can be a subject of discusssion/negotiation = i am bored and want milk / i don't want to give you milk i am busy / i want to make you go to sleep so here is milk / i don't want to.
Ds1 stopped at 2.5, my choice not his as I was pg with ds2 and very ill. Now 21 weeks pg and feeling great but ds2 hasn't taken for 2 weeks now, he isn't interested, I am very , really wanted him to continue until at least same age, feel he has been cheated even though it is his choice, just don't think he was getting much from me.