From the mother of a girl adopted at age 3:

Our daughter came home at age 3.  The initial  adjustment was very easy - she ate well, slept fairly well and tried  hard to be a good girl.  The only difficulty during the first weeks  was that she was terrified of my husband and ONLY wanted me.  After a  few weeks she began to loosen up and show her true colors - both  good and bad.  In a lot of ways bonding seemed to come quickly and  easily - she has always been very affectionate toward us, for  instance.  But she did grieve and go through a lot of anger in the first several months home.  She is now a delightful, strong-minded girl who is completely at home with us.  I wouldn't say that her  adjustment was easy, but neither was it overwhelming.  And it was every bit worth it!  In fact, I'd love to do another toddler adoption when finances permit.