Age computed wrongly when date of birth is in future

[vvikramraj]

Describe the bug
Modify the date-of-birth of a patient to be in the future.
No matter how many years into the future, age shows up as -xx days old.

Component
SDC library

To Reproduce
Steps to reproduce the behavior:

1. Launch demo app.
2. Choose a patient from the list.
3. Edit their birthdate so it is in the future(at least 1 year from now).
4. Navigate back to list.
5. See error

Expected behavior
Either disallow dates in the future, or compute the diff properly.

Screenshots

Smartphone (please complete the following information):

• Device: Pixel3 emulator
• Version 28

Additional context
Add any other context about the problem here.

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