Hahaha, no. 2011 starts the eleventh year. Since this year is not over yet it has not been a full ten years = decade. So, that’s 9 years and 12 days and 15 hours and 14 minutes so far.
NO
How many years has someone lived if its their tenth birthday? They have been alive a decade on their tenth birthday.
Zero to one is the first year.
One to two is the second year.
So on, so forth....
Nine to ten is the tenth year.
You are mistaking for time lasp for anniversaries.
Zero to one is one year of time, the first year.
Even though someone is not 1 year old until their first birthday, zero to one was still their first year. Nine to ten is their tenth year.
“””””2011 starts the eleventh year.”””””
2011 starts the 2012th year.
2011 years have already passed.