NEED HELP; the days of our lives

Hi, need help! no idea how to do this kind of program.
Any help will be appreciated!

Your program should take the user’s birthday and allow the user to answer a series of
questions (from a menu):
1. How many days have I been alive?
2. How many days until my next birthday?
3. How many days until I reach Four Score and Seven years?
(this could be negative …)

Things to keep in mind: enhancing maintainability with appropriate use of constants, proper procedural abstraction and documentation.
What are you stuck on? This is pretty clear cut.
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