21,384 days
which includes an extra day for each of the leap years from my "birth"-day until the last leap year.
Now, if you want to count in utero time, which is only right, because I came into existence the moment an egg and sperm "got together", then the amount of days I've been in existence would be:
21,686 days
up to and including today at my time of birth.
If you want to count days actually "lived", that would be difficult to quantify. What's the definition of "lived"? I've existed 21,686 days. I've "lived" ????