I think it's entirely up you. My best friend is still breastfeeding and her daughter is almost 3 years old. My oldest was 6 months when she stopped, my second was 8 months and I'm breastfeeding my baby (6wks old). But personally I couldn't see going past maybe 1 1/2 years to 2 (but that's just me).

4NicoleLos Lunas, New Mexico
Moms Expertise
    8Theresa Gould
    Each of mine were all different. There's no one size fits all that's for sure. The shortest I've nursed is 11 months and the longest was almost 4 and was ready to keep going.
    About Nicole
    Current: Los Lunas, New Mexico
    Birth: July 29
    On since: Dec 17, 2013
    I'm so blessed to have my 3 beautiful girls, Marron, Havyn and Nahara and my handsome little man Kyle! I've been a SAHM for 2 years now and my husband have been married for 7 years! ^_^