Challenge 27 027_Your Dying Day

A python challenge that allows discussion of interfaces and the way computers use mathematical modeling in a variety of circumstances.
This gives the opportunity to decide which factors students think are most significant in predicting future lifespan, for example is it better to be a non-smoker or be aged over 95 years?
The problem lends itself to a functional style as each of the factors can be modeled and tweaked independently.
I have used the datetime library and included a quick example file of its use.
The files with filenames ending py are python files and will need the .txt part removed and a dot inserted to make .py files.

NB: The numbering system does not indicate difficulty or teaching order but is to help with my resource management.