Parameterize the age in the `is_person_demographic_tanf_eligible` variable

[vrathi101]

Fixes #4958

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.13%. Comparing base (cb92a56) to head (7bb1042). Report is 15 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5163   +/-   ##
=======================================
  Coverage   99.12%   99.13%           
=======================================
  Files        2592     2598    +6     
  Lines       37707    37771   +64     
  Branches      162      162           
=======================================
+ Hits        37378    37443   +65     
+ Misses        297      296    -1     
  Partials       32       32           

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