# Inspired by: http://kk.org/ct2/2007/09/my-life-countdown-1.php
# Life expectancy data:
# http://www.health.state.ny.us/health_care/medicaid/publications/docs/adm/06adm-5att8.pdf

$ python
>>> from datetime import date, timedelta             

>>> birth_year      = 1976          
>>> birth_date      = date(1976,3,2)
>>> life_expectancy = 76.09

>>> life_years = int(round(life_expectancy))            # 76
>>> death_year = birth_year + life_years                # 2052                  
>>> birth_date_day_of_year = birth_date.timetuple()[7]  # 62 
>>> percent_of_last_year = life_expectancy % 1          #.09                 
                     
>>> days_to_live_in_last_year = timedelta(days=birth_date_day_of_year+percent_of_last_year*365)

# Start from dec 31 to avoid off-by-one error         
>>> the_day_i_will_die = date(death_year-1,12,31) + days_to_live_in_last_year    
     
>>> the_day_i_will_die.ctime()        
'Thu Apr  3 00:00:00 2052'

>>> days_until_i_die = (the_day_i_will_die - date.today()).days  # 15616               
>>> days_lived = (date.today() - birth_date).days                         # 12175

>>> total_days_i_will_live = (the_day_i_will_die - birth_date).days       # 27791

>>> mid_life_crisis = birth_date + timedelta(days=total_days_i_will_live/2) 

>>> mid_life_crisis.ctime()
'Wed Mar 19 00:00:00 2014'