Please do note though that the decision of WHEN to actually stop breastfeeding your baby is ultimately up to both mother and child. (abckidsinc.com)
In reality, most moms in developed countries stop breastfeeding their babies much earlier than that. (easybabylife.com)
Speak to your doctor, or pediatric nurse - but don't stop breastfeeding your baby just because someone elses baby was lactose intolerant! (wehavekids.com)