>>>>Two days ago, I was 10 years old. Next year I'll be 13 years old. What date is it today?
>>>
>>>February 8.
>>
>>Assuming his birthday is December 30th, then
>>
>>On December 30th he was 10 years old.
>>On December 31th (today) he is 11 years old.
>>
>>Today is Jan 1st.
>
>That's correct; except that the birthday is on Dec. 31. "Today's date" is Jan. 1st. Two days ago (Dec. 30) the person was 10 years old; on Dec. 31 he was 11; this year (on Dec. 31) he will be 12, and next year (on Dec. 31) he will be 13.

Yes, exactly.