It's funny. With my first one I said I would try to nurse her until she was a year. A year came and went and I couldn't imagine her or I giving up nursing yet. I remember when she was 16 months old people being flabergasted that i was nursing such a big girl (maybe it was because I was 8 months pregnant at the time) but she just still looked like such a baby to me and so obviously still needed my milk. I could never have imagined tandem nursing when I started out, just as I could never have imagined nursing a three year old when I started out. But when the time came, listening to my girls and to my instincts, I just couldn't imagine doing anything else. I had never seen older children nursing either, but it wasn't about older children in general---- It was about my nursling and what she needed. Picturing what it will be like to nurse an older child when you are holding a tiny infant is difficult. But when your tiny infant grows and still needs your milk, it's antibodies, and the comfort nursing provides, you aren't looking at this great big child, you are looking at your grown baby. And giving your baby what she needs is just natural. My older daughter weaned herself when she was just over 3 years old very suddenly--which is how she has done every developmental task. My younger daughter is still nursing occasionally and she will be 4 the end of November, but is just as big as her 5 year old sister. I can't explain why nursing her doesn't seem weird, but it just doesn't. And when the time comes, if you listen to yourself and your nursling and not to other people, it won't seem strange to you either.