As a childless woman I am not one to profess my knowledge of children, how to raise them or how to respond to them, but I will say from my limited experience (between nieces, nephews and friend's children) the magical years for children are really three to ten. During these years the combination of fun factor, independence and cuteness is really at its optimal. When everything they say and do (whether good or bad) either makes for a great photo or a great story later.
We had the opportunity to spend a decent amount of time with my nieces these past few weeks who all fall within the magical year age range and had a blast. They are sweet with just enough to spice to keep you on your toes. They are funny and entertaining and make you feel more fun and entertaining in their presence. They are good people to get silly with and good people to get hugs from. Although we thoroughly enjoy our childless existence, we are grateful to my sister for having additional people for us to love.