Judy passed me this tag. I'll do it based on XY as CE is only 1 and a half years old. There're only 4 years to choose from coz she's only 4+. I think I'd like her to stay at age 3. The reasons :
* She can communicate very well with us already.
* She's not learnt to answer back rudely.
* Most importantly, she's overcome her phobia of visiting the doctor.
* And she's not afraid of taking medicine anymore.