SQLite: How to calculate age from birth date

Question

What is the best way to calculate the age in years from a birth date in sqlite3?

Answer 1

SELECT (strftime('%Y', 'now') - strftime('%Y', Birth_Date)) - (strftime('%m-%d', 'now') < strftime('%m-%d', Birth_Date));

This one works.
I merely ported this MySQL example: http://dev.mysql.com/doc/refman/5.0/en/date-calculations.html