[Boost-users] [date_time] Get age in years

I'm trying to get the age of someone in Years and/or months and/or days. I've tried: date_period dp(day_clock::local_day(), birthdate); cout << "You are " << dp.length() << " old" << endl; But that only calculates days. Is there a static function available that will turn days into months. and days into years? Thanks -Jason