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DD did at 13 months. I'd turfed DS off at 15 months so wasn't too bothered about her turning her nose up a little early, but I have heard of people who battle through it - try googling 'nursing strike' if you want to try and make him change his mind.
self weaning us usually a gradual reduction until they stop. it is unusual at that age but not unheard of. my eldest did. he dropped feeds bit by bit til it had been a couple of weeks since his last feed. a sudden refusal is a strike, often caused by teething or a cold and you can get through it and keep feeding.