DS6 has made some observations about the human life cycle and where his family fits at each stage.
Maybe try putting together a little album of the women in her family and showing a progression of pictures from them as babies to toddlers and on up.
You could also make a big timeline with her on human development. She could see where she has been and where she is headed and about how long each stage lasts.
Where your daughter is sad she isn't more developed my son is sometimes sad he is changing too fast.
He says "Everyday the little boy that I am now dies a little. When I am older I won't like the same things or look the same or even feel the same. The person I am now won't exist anymore."
