17 months. We co-slept and nursed on demand until 14 months. We then very slowly night weaned. AF returned 4 weeks after DD was completely (8pm-5am) night weaned. As others have said, the first one was terrible. But now they're a little lighter than before.
FT mama to DD (April 2011), PT-WAH lawyer
Married to my best friend (October 2009)
Lovin' that BFing