what age do you thing a child could start being taught knitting ? My cousins little girl (2 1/2) was very interested in watching me knit and sat on my lap between me and my knitting and helped me put the wool around the needle. She is good with her fingers and listens well to intructions.
At that age I tried french knitting with my daughter. You know the sort of thing that has 4 pins and you wind the wool round and hook the stitches over. It makes a lovely long knitted string that they love playing with.