Time to put you out of your misery:
Ok, let's say the date is 1 Jan 2016.
The day before yesterday he was 8 (Yesterday = 31 Dec 2015 and the day before was 30 Dec 2015).
His birthday was the 31 Dec 2015 when he was 9. On the 31 Dec 2016 he is 10 and on the 31 Dec 2016 he is 11.
Haha
Me thinks you rather enjoy us all in a little misery
This was perplexing in many ways yes
Thank you kindly for the explanation
I know you have another one up your sleeve Sir 😊🤗