Aging rapidly

Upon arrival in the U.S. on June 10, Yosef (who, like many Ethiopian children, had no idea how old he is) learned that, on paper, according to his Ethiopian birth certificate, he was TEN, that he had turned 10 on May 28.  He was still in the orphanage on that (invented) date, so there was no birthday party. 
 
On June 16, mere days after his arrival in the US, we had a tremendous water balloon birthday party for Helen and for Yosef, as Helen insisted on sharing her party with Yosef.  A mob of children screeched out Happy Birthday to You, Yosef blew out his candles and he opened gifts.  That night he announced: "Now I am eleven." 
 
Today a late birthday gift was presented to Yosef.  As he eagerly tore into the wrapping paper, Daniel said, "Uh oh.  Now Yosef 12."  

                      
Yosef