One and a half: Quotes from Isaacland

So we have been training Isaac to say his age. But since he seems to have no concept of time we have to regularly update him that he is growing 'older'. I am also trying to help him see opposite ... fast ... slow..old... young
So we are a taking a walk and a few school kids walk past and say 'Hello' to Isaac and Ziva.
Isaac turns around and says ' Ziva is one and a half'

The kids have a puzzled look shrug their shoulders and start to walk away when I call out 'He means Ziva is one and half years old!'

I look at Isaac and say 'Isaac you have to say Ziva is one and half years old'
Isaac 'No Isaac is old .... Ziva is young!'

So much for opposites!