[bugfix] Dont go out of bound if people are too old.

[lrnv]

When people are too old for the life table, this PR added a simple approximation by clamping them into the time frame.

This is an approximation, but should be good enough for people that are not too far. This allows to always give a rate whatever the person, even if it is a bit approximated.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.56%. Comparing base (84b2edd) to head (a5c8c5d).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #26      +/-   ##
==========================================
+ Coverage   73.68%   74.56%   +0.87%     
==========================================
  Files           4        4              
  Lines         114      114              
==========================================
+ Hits           84       85       +1     
+ Misses         30       29       -1     

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